Hey, your ballpoint sketches are fantastic! Did you do them completely freehand? If so, bravo. While you're building your collection of markers, try Painter's marker sets, they're pretty damn good, though like everything in painter they take some getting used to - assuming you have regular access to it.
Also, I recommend "Anatomy for the Artist" as far as your hands problem goes, I learned probably 70% of what I know about anatomy out of that book - the other 30% mostly from studies. You should be able to find a newer edition at Barnes & Noble, mine's gigantic and about 10 years old now, but I've seen some nice softcover ones recently that are reasonably portable. Anyway if you come across it, flip through it.
Your coloring is definitely not up to par with your lineart, which I can sympathize with, it's taken me a long time to get anywhere with color and my painting is still awful. I don't have much of a specific critique on it right now, partially because I'm tired and partially because I don't know enough about it to be informative. Keep practicing is all I can say.
Oh yeah, your nouveau borders on some of your pieces are excellent.