EDIT: (no image quote)
ORIGINAL:they look nice, good contribution, but the bump maps shouldnt be normal mapped diffuses,
they should be singularly made maps that look like this VV
how to make a height map in photoshop is to understand what the highest extrusion on you bump is going to be, the normal, cause in this technique you cant make anything higher than white. white is your normal area, the standard blue, grays and black are lowered bevels.
after making a height map, you can render height to normals, normals to cavity which looks like this VV
Cavity maps are good for overlaying detail into a diffuse, it can add depth to a flat texture.
and of course with a height map you can render an ambient occlusion map as seen below VV
and thats a minor tutorial on the texturing process following the creation of a diffuse, cause otherwise youll get low quality grain, which may be good but on a lower level and using a detail map.