First impressions:

1. Too much light.
2. Shadows are too sharp
3. Too clean environment (add some fog... even a tiny bit helps often for outdoor shots... and maybe even some DOF)
4. Bump maps could use some more resolution
5. The heart with the arrow decal looks like it's bumped outwards... shouldn't it be carved inwards?
6. The Stop-sign pole looks a bit too thick...

Don't get me wrong. I just listed some things I would change. This image has lots of potential to be a really nice one... Keep it up...