Wow, great background! I like a lot how you erased the face of the upper girl, it reminds me something similar I did with one face in an old work (kinda Giorgio de Chirico influence). Anyways I see some weird things distracting me, specially the brutal sharpenning you applied here, the borders of all elements are distracting a lot in my opinion.
Anyways, nice pic. I wonder how you did the "flying things" lol :]
It's a render after few explode filters applied. About sharpening: when I get myself some tablet I'll try to make things more painting-like and it gona result in more dreamy-blurry things. For now I prefer sharpened and solid. However I do agree that borders are heavily damaged.
Thank you for the critique. Till the next one I'll try to improve myself!