Did you use a photo as a background base? I think it looks really great, especially the clouds
The character itself looks good, with the exception that her shirt seems to become muddled with her torso. I guess it is because there are no sharp edges between the shirt and her skin. Also, her right arm seems to be shorter than her left. With that pose, I would think her head should be a little lower, since she is leaning on her right arm. This would cause the shoulder line to be slightly tilted, which would make the arms look better.
Anyway, that's just random thoughts that occured to me while looking at it, it is a really good interpretation of the weekly challenge