I have been trying to learn how to paint in photoshop. I would have to say what I struggle with the most is to keep the painting away from being too mushy. I'm still not used to it, but, nevertheless it's really fun. It's such a good stress reliever from my classes. Currently, I am taking classes for maya modeling and traditional animation.
Here's a Sargent copy I did today in photoshop:
How to make it more "painterly" and less "photoshoppy" ?
Gotta practice more!!!!