seriously try removing the concrete texture from the paint it will look so much better, the paint should be almost flat colour in the diffuse, try it and see then start adding a little bit of dirt, otherwise it will always look like dyed concrete not painted
It looks cool, the cobbled part in the centre doesn't look right, maybe its because it looks like its only a normal map. The large amount of concrete on top of the bricks seem a bit off also, it seems that they're too different a material/in quantity. The paintover looks good apart from the concrete pontoon, those things…
looks great, few things i noticed that after first glance thought about were the damage in the brick that was similar to the damage in the concrete i think the brick wouldnt damage the same way. you have it the right way in other spots but the one spot thats modeled looks like its supposed to be concrete. and the pillars…
The top and bottom parts are hard to read in terms of material definition. I assume it's concrete but it's even harder to tell when you combined a futuristic metal / laser with standard concrete support. The top bolts seem to be lost completely in the normal map? Reminds me of Half Life.