Perspective is screwy... It seems like there's no vanishing point and there's not enough distance between the building and the ground, which makes the girl look almost pasted on in a way... unless she's on higher ground than that of the building?
I think the perspective could be fixed with more shading to better suggest the light source. How the light affects the objects affects how we translate the general location of said objects in our head. Some places it looks like it comes from the right, sometimes the left. and also to shade everything, as some places are wonderfully shaded, and others are just white and blank.
I do love the birds though. :)
