She looks sad, like she misses someone or something, hope she feels ok soon. Otherwise, nice background and hair.

I like the colours and pose! However, the way her legs connect to her body doesn't... seem right. It's /really/ wide. For her shins and feet to go out like that, her thighs would have to be pressed against each other and wouldn't take up so much space.
I also like the grass, but its soft fuzziness doesn't really match the character's crisp outlined appearance. But the background viewed on its own is very pretty and soft. And again, I like the character too, her design is simple but appealing ^^ Her hair is unusual, without coming off as ridiculous