Well I only started digitally painting about two years ago. I have studied fine art for years like anatomy and what not and that really does help. But, what I'm saying is you can make surprisingly quick progress!
I looked over your other work, you're pretty damn awesome I gotta ask, cause I'm working through finding a happy inbetween for line art. How much of a base do you draw before you start painting? I've been working on a person portrait and lately I keep having to change so much cause I just drew the outline of the head.