I don't know how you'd fix it because i don't have the mind of a texture artist at all but the blood on the bulldozer blade looks like hot plastic melted to it or it's a heavy coat of paint. it doesn't look like blood at all.
Uhh yeah, no Dropbox at work, that's all. Thought that'd be obvious.. I think you could go much further with specular and reflection, lacks definition. Also a lot of it looks like solid colors with arbitrary stuff like the blood sploshed on just to fill it up.
the biggest issue I have at the moment is that the Chaos stuff looks pretty tacked on without any real integration into the overall vehicle, in particular the skull on the back looks like it is held on with little more than crazy glue. also I'm wondering why this Chaos vehicle has the seal of the Inquisition on the top…