First off, I really like the angle of the shot. It makes the picture more dynamic.
I think the photoshop work needs some more attention to detail. on the left side there is a strait line where the picture comes back into focus. It can also be seen on the balloon strings. To fix this you could probably use the smudge or blur tool.
The other thing I like is how the model is dressed. I think the simple dress is perfect. An over the top frilly or too detailed outfit would have detracted from the sweet simplicity of the picture.