Add to her as in, to her hair or the overall doll? Do you plan on adding shoes? Aaaaand what type of doll are you aiming for?
To me she looks kind of fantasy-ish, kind of indian with her clothes; I would add a lot of jewelry on her arms, but keep the neck bare. I would also move her bangs to her sides a little so we can see more of her face, 'specially the eye on (our) left.
Oooh alriiight! So using the infos I just nabbed on wikipedia this is a fantasy-esque world. Well yes I did get the fantasy feeling out of the doll, so YAY! XD
But as I see from google images they're dressed pretty casually, pretty "normal" if I could say. Then I'll base myself on these images to give some advice.
I was gonna suggest a jacket but since this is a Summer outfit... shoes, obviously, maybe simple gladiator sandals, black (I trust you're keeping these colors for the outfit - purple, blue and black?). Well, go for open shoes anyway since the outfit is small and revealing, closed shoes would ruin it.
As for the skirt thingy, the shape of it is weird - I'd make it more like a pareo, with a straight, slightly curvy line instead of this f-shaped line. If you need more explanations I'll redline for you tonight when I'm back from work XD
You could add some nice Summer-ey bracelets, either beaded, thread-breaded or both? Nothing metallic.
I like the movement in her braid, but the pose is very static like she's standing. Is she running? Is it windy?
I used the gimp, so it became all blurry since it'S bmp -_- I'll know for next time, sorrry 'bout that. Anyway, does this help? I added lines where the folds should be approximately in the pareo, some really quick crappy shoe design that I think would look nice, and of course moving the bangs to the sides.
EDIT
Yes, do post palettes! I'm really bad for judging palettes until they're used on the doll, though XD well, we'll see.