The second and third screenshots would be more useful if they were wireframes or texture flats or something. As it stands, they are all basically the same shot. :) Also, some better lighting would show off your work more effectively. In terms of crits, these are a solid start but they are lacking any sort of character or…
Is it both that are that way or the blue one? I can see how it can appear to be concrete, I felt the rust stains would offset a bit of that. Might be my lighting partially as well as material definition. I can give it a second pass and push the metalness values and roughness values, I definitely lowered them so I can see…