I think theres just a mass amount of blank space. Maybe have a row of diagonal lines for the background..something simple. Also the vector woman's face is a bit jagged, thus causing the outline to be jagged. Another thing, maybe if that whole navagation title thing was centered right in the middle, it would seem less spacious. I like the whole concept tho, definately not a throw away. Just maybe some tuneups.
Good job.
Cheers

