Wow, quality differs a lot between those. Really a huge lot.
I generally like the sketches better than the colored pieces. It is sadly really obvious that it's your first try at coloration, especially with the hair. A solid base and single one colored streaks do not work really. Either you draw it entirely in a streaky stile or you leave that out mostly. Also, all that glitter seems more disturbing and you have to practice blending. Tip- Do not zoom in, just take the fullview for coloration. That works best for usual. When you get more used to it, only zoom in for details like eyes and the like. But I mean like, veins and really small details. That mostly applies to realistic style, though.
I like that sketch that you have in your sig as well. Pretty dynamic, nice style, got a lot too it. Really high quality. The one that you posted just after that is at least 20 times worse. Shape of head, nose and especially eyes look really weird and her boobs are pretty asymmetric. Semi-side view definitely works better with you than front view. You should practice regarding that.
It's not bad, take it that way. As I've said, that one sketch even is really damned good.
