With the bones of the scene now starting to form it is a good time to start fleshing out some of the finer details and begin refining the picture. Again on a separate layer start painting in some of the gaps between the stonework using a dark brown colour but concentrate mainly in the foreground where the details will be more apparent (see the image below). This has helped give the scene a better sense of perspective as well as creating some interest in the foreground and carve out the stonework a little more.
Step 12 :
The last stage helped suggest the stonework in the scene but what it needs now are some highlights along some of the edges where the light will be reflected as well as some lighter grouting along the columns to help add a sense of scale. On a separate layer set to Soft Light and using a small airbrush set to a pale brown (R204 G186 B153) start painting in grout lines along the columns. Also use this layer to add in highlights down the edges of the columns and around the flagstones as seen in the image below.
Step 13 :
With this stage of detail in place the next thing left to do is emphasize the sunlight penetrating the dark corridor and create some atmosphere by showing the sunlight filtering through the dusty interior. In order to do this, another layer was made and then with a selection group made that emanates downward from the skylight widening as it descends (see the image to the left ) I simply feathered the selection so as to soften the edges and then applied a gradient that blended from a yellow to a red to help accentuate the dust particles in the light beams. I then repeated these steps for the second vent but this time just used a yellow through to transparent. The layers were then set to Screen blending mode with the nearest
Set at 54% opacity so as not to appear too bright in the scene (see the image to the right ).