Making the colour map
When you open the baked texture file in photoshop the first thing you might notice is that the top part of the leaf (the one on the right) and the bottom part (one on the left) have the exact same pattern that's because of the nature of procedural textures but to fix this use the heal tool to change the inner pattern on one of the leaves but make sure you don't change outer edges of the leaf because we still want the texture to remain seamless. In this case I find it better to use bigger brushes with their hardness parameter set to 0, that way the healing changes will be more subtle, after you finished healing one side of the leaf rename the layer to "base color".
Now we're going to begin painting some of the details into it but first open the wireframe map that we baked, copy and paste it to our image, position so its right on top of our base color layer and rename the wireframe map to "Wire Reference" and change the blending mode for it too multiply to be able to see it on top of our base color texture, now create a new layer on top of wire reference and rename it to "Leaf Pattern"
To make the leaf pattern you could make a new document and make it so it's about one fifth the size of your canvas, what we're going to do is make a custom brush for the pattern shape. Use the image on the left as a reference for the shape of the costume brush, to make the custom brush just select the entire canvas, then go to edit > define brush.
In the LeafPattern layer, use your new costume brush to paint the patterns on the left side of one of the leaves, then you can simple make a duplicate of the layer and flip it horizontally (image>adjust>flip horizontal) and position it on the right side of the leaf and adjust some of the strokes by lasso selecting them and moving so they come in contact with the edge center vain or you could make another custom brush with a pattern that is flipped horizontally and paint the patterns on the right side, after you finished making the patterns for one of the leaf sides, duplicate the layer and move it to the other side and make regular brush strokes to compensate for the differences in a few areas. Here's a screen of the leaf patterns with the wire reference layer hidden. After you finished positioning the patterns merge all the leaf pattern duplicates into a single layer.
Make a duplicate of the pattern layer and rename it to "pattern soft shadow" and apply a Gaussian blur of about 5, now change the blending mode to soft light, and move it so its a few pixels below the LeafPattern layer.
Change the blending mode of the leafpattern layer to "darken" and change the opacity value of the layer to 25 percent just as a temp color, were going to come back on this and make some changes to this layer later in the tutorial.
Duplicate the "pattern soft shadow" layer and rename to "pattern soft highlight", adjust the hue saturation for that layer, we're going to give this layer a dark green color tone, check colorize and give hue a value of about 115, saturation of 100 and lightness of 10. change the blending mode to hard light and to make the colors more apparent make a duplicate of the soft highlight layer and merge it down (ctrl+e).
Hide the leaf pattern layer and the soft shadow layer, make sure your wire reference is not hidden, now sample the dark green color in the soft highlight layer and paint in the outer edges of the center vain of the leaf, you might want to give your brush a little bit of scattering (in brushes tab) in order to make the brush strokes look a little more random than uniform and change the flow and opacity of the brush to about 50 percent. Use the following image as a reference for painting the dark green areas.
Create a new layer above the pattern soft highlight layer and name it pattern detail, for this were going to make a custom brush to add some detail to the pattern, with this brush it should look like the patterns have this root/lightning pattern on
them. Open the brushes tab in order to customize this brush, enable scattering and give the scatter amount a value of about 95, enable texture and give the scale a value of about 95 and a depth value of 90 in order to give the brush more detail, now pick the texture called "metal landscape" that has the exact effect were looking for, increase the brush size accordingly, also change the opacity value of the brush to about 75 and flow of about 60. Your brush strokes should look something similar to this:
Make sure you increase the size of the brush and the scale of the texture as you get closer to the center of the leaf and decrease it as you get closer to the bottom. To soften and add additional detail to the strokes after you finished going trough all the lines in the leaf pattern, increase the size of the brush and the scale of the texture even more and decrease the brush opacity to 30 percent and give the patterns another pass and that should complete the leaf patterns, now just change the blending mode for the pattern detail layer to overlay and opacity to 75 percent. Use this image as reference for painting the detail strokes.
We're going to go back to the base color layer and add more detail to it, we want the color to be darker in a few areas and lighter in others, we also want to make it look a little sharper since the procedural texture gave us good color tones to work with but not as much detail nor sharpness. We are going to use the dodge and burn tools to make areas darker and lighter and the sponge tool to remove and add color from a few areas as well. Pick the burn tool and change the brush size to about 50, an exposure value of 15, and in the brushes tan enable scattering and give it a value of about 260, enable dual brush and pick number "60" that brush will give us a good level of detail to work with. Start painting, its up to you too decide witch areas of the leaf you want to be dark or lighter, for now just paint the dark areas with the burn tool and when your happy with it make other areas lighter with the dodge tool, make sure the dodge has the same brush size and style parameters as the burn tool's current brush. Try not to paint on the edges.
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