Ah, the smooth lines is what I use adobe illustrator for! When I used illustrator, I was actually really surprised at how much better the work looked, just from the smoothing of the lines.
Clord: I find the best tools to use to learn are videos of people telling you their workflow, not those that tell you how they actually did the art. For example, one that shows the image ps they used as references for clothing (mixing and matching, etc), same for lighting and texture. I've not gotten to implementing every technique within the same body of art, but I'm working on it one-by-one.
A handy hint for your next piece: remember that clothes and hair don't share the same line as the rest of the body. Your clothes 'hover' slightly above the body in terms of the top outline for each.