1) Love the colors used!
2) It may be just me, but the neck looks a tad long.
3) What style were you going for? US comic, manga, original? It helps me to critique if I know what parts are purposefully done.
wink In general, I'd say a female's shape should be a little curvier in the mid-section -- I can see the clevage curves, but females' ribs should scoop inward when seen from the front (on most people anyway)
4) The shoulders are slightly uneven. More on proportion: The upper
arms should be longer, if you look at your body right now your elbows hit at about your hips. Wrist should hit mid-thigh. A trick to arm proportions: break out the 'ol compass from middle school, the one with a pin one one side and a tiny pencil on the other, and make the arcs depending on how you're positioning the hands [A lil hard to explain, I hope you understand what I mean]
5)Since you portrayed the demonic pendant shining, you should have light source on the skin indicating that. For the most part, you did good on the primary light source -- I really love that hat!
That's all I can give ya as I haven't been drawing lately and even if I had, I do more transposition pieces and fanart cels, I don't do much original art.