start now! Go sit down for 5 mins or however long you can and doodle. Quickly sketch what you see. That's how I started out then after getting to grips with shapes and shade I began to understand thre light source, well sort of. my light source could do with more work. I'll be happy to help you out.
OMG!!! U have gotten so much better than me! Damn it!!! U stitch clothes and i paint on clothes and shoes! I do some photo manipulation and u skip me in digital painting!!! Darn it, I will kick ur butt!!! T_T