A suggestion. It is better to finish your unfinished piece (and in the future, perhaps; pieces) before starting new ones. Other than that, the shading on the hill is too dark from shade to shade, let the colours sort of leak into eachother; I don't mean blur it more, I'm not fond of the blur too, I mean to pick at least one colour to go in between the colours you have (try selecting a colour where the shades merge).

Her head is too big as well, perhaps you wanted to have it big for more detail, but it would be more aesthetic if she were proportionate (And remember to darken up the lineart, it will be easier to colour that way).

The clouds are very nice though, I often have trouble doing clouds, one bit of advice about them though; I don't think that they should slope with the hill, but that's the only thing odd I can find about them.
Just trying to be helpful, so you can't complain that no one tells you how to be better ~_^.

(P.S. Giving the girl a bit of a shadow would be cool too.) *Shrugs* Anyway, I'm not trying to be harsh, I know your unfinished, but I always think that if one starts out with a strange picture, they'll end up with a bad one. Just trying to prevent that, but do your own thing.
OH and be sure to finish your picture with your next edit, because you're close to the KB limit.