Erm... Are her shoes floating? >_> No offense or anthing ^_^' If you wanted them to look like they were sitting on the brick wall, it would've been better if you put the shoes up higher on the wall. I also have to comment on the brick wall. The top looks way too straight, it looks like you took a stock of a brick wall and just cut most of the top off.. And it stands out too much.. Eheh.. Sorry for so many critics ^_^'
I really like the background though. The sky is beautiful ^_^
Keep it up :)