The way you have her sitting on the bed makes her legs look quite large. If you have her raise up a little rather than sit on the legs, this will improve that aspect of the photo. Lighting is fairly flat and does not look natural for a bedroom setting. If shooting in the bedroom, the light should like it is light in a bedroom. The background items on the right are distracting and do not add to the photo. The outfit does not go well with the bedspread. Hope this helps.
And now for the required photo from me:
The girl is on a bed lit by a window right by her bed hence the bright quality of the light to create a natural setting for "sleeping beauty".