need help with bump mapping

Here is a low poly model with about four textures applied to it all giving bump mapping. I applied indirect lighting and environmental lighting, but when I do that I don’t see any bump mapping on the underbelly of the dragon/dog/armadillo I created. For the footage I’m using I need indirect lighting and environmental lighting. I have tried using a displacement modifier but it don’t work too well on a low poly model. What can I do to make bump mapping apply to the underbelly of this thing while using both environmental lighting and indirect lighting.
.blend =


How did you set up the bump mapping? What are your material setups? Show us screenshots with your material and texture settings, or better yet, upload a .blend (don’t forget to pack it first) so we can have a closer look.

Okay, i have a .blend up.