Its awesome as it is, but two things:
1. The "Best in the World" font looks like there's been a filter applied to it, like Spatter or Accented Brush. I don't know if its normally like that up close but if it was done by you then you should probably go back and leave the font alone.
2. The lighting from the bottom is what throws me off the most. It should usually be white and sometimes coloured, but the grey colour should never be used for foreground lighting.