Cartoon UI & Background Design

I have a 2-D, football-themed web browser game that already runs, but the look and feel still feels like a prototype. I now want to polish every screen and scene so the whole experience is playful, consistent, and unmistakably cartoonish... (Budget: €1500 - €3000 EUR, Jobs: 2D Animation, 2D Game Art, 2D Layout, Graphic Design, Icon Design, Illustration, Photoshop, UI / User Interface)