Drag your new layer underneath your background layer like so
After you drag it underneath that layer it should look like this
Step 7
Now is the important step go above your layers and set your background layer to multiply instead of normal like this
Step 8
To get the painting done quickly I would suggest working monochromatically. This would mean all in one colour. I started out by colouring the whole canvas a medium blue color
Step 9
This is where you want to get loose and the most fun part about the painting. Grab a dark shade of your chosen colour and fill in all of your dark areas. It is good to have a light source in mind that way you can tell where your shadows or dark parts of your painting will be
I like to work dark to light it is very fun that way. After you are all done you should have something like this