I agree with cryrid, the UV layout isn't helping at all. It's wasting space and wasting pixels. You could make a few adjustments, straighten some pieces out and utilize more pixels. There is way too much lighting, highlights and shadows in the diffuse material. The diffuse is just color information with hints of lighting…
You've got a diffuse and a normal map posted - is there a spec as well? There is very little reason to use a normal map without a specular map - if you don't have a spec map, you'll get better material definition by painting the spec into the diffuse, and at that point you're painting in lighting, so your normal map is…