That braid looks like it would be handy for the amount of hair she has, I like how her hips and feet came out. Where her arms attach could use some work, but nice piece none the less. Maybe you could have a lake or waterfall in the back?
I like the look of her half-finished braid, and the ripple and moon-like curls on the ends of her hair. (for backgrounds ideas I'm personally divided between like, a tall old-fashioned arched window with lots of square panes and the fanned-out pattern in the curve at the top and maybe a glimpse of sunset through it, or sitting on a curved striated gold/grey/black pattern like stylized Saturn-rings - but those are probably just me. :p)