I tried to think of the simplest way of doing this, and came up with this! Hopefully everyone understands it!
1. Get your design (without shading).
2. Add your shading but NOT the highlights.
3. On a separate layer, draw lines with a darker color from the base color where you want your wrinkles.
Note: You can blur the wrinkles if you like that style better
4. Add your highlights in the areas without wrinkles. (You can also add highlights on the wrinkles as shown in the second image and shading below like in the third image)
5. Change the opacity of the wrinkles and highlights to your liking.
This is mine!
And you’re done!
Here’s what my finishing product looks like!
