Background editing has left a lot of ugly looking patches which can be seen depending on the monitor. Would look a lot better with an effective even background anyway, rather than one which is 100% white. The clothes work well here, it's a shame the subject looks so unhappy. Hands are a really important part of any portrait if they're in the shot, it's a shame they're half hidden here. Not sure about the composition, any special reason here not to use rule of thirds? Otherwise the negative space feels unbalanced.
It's a shame we can't use the 800 pixels in an image like this so that we can really see more detail of her face. I like how the netting swirls around her. She has lovely eyes. I wonder if it's me, but I'd do a touch of sharpen on her face.
Isn't she just a pretty child! This is a very good studio shot but I think her skin tone might be slightly off. Her dress fades into the background perfectly and maybe use a little gaussian blur to give that fairy tale effect.