A tutorial on vexelling lips. I'm sorry the file is so big and the tutorial so long, but it was aimed more at beginners and so the first half is quite detailed.
As usual with my tutorials, if there is anything you need help with or something you don't understand then feel free to let me know and I'll see if I can help you ^^
Transition layers. They're layers between your first layers of shading of colours similar to the colours either side to help create a smooth transition from one main colour to the next. They can be done as more solid shapes, as gradients or as solid shapes at varying opacities.