Ok cool, now here are my crits.
Im having trouble establishing what the texture is. My guess would be concrete. If so there a couple of things to take a look at.
First of would be noise, if these were repeated for modular work, there is too much going on to help explain what the material is, and the wear/age. Concrete tends to be rather plain, but can be enhanced with chips, moss and dirt, which can be seen here. However, these details are applied rather randomly, and dont come across as well as they could. I would concentrate the dirt in the crevices, and near the bottom where more contact will appear. Moss tends to grow in damp areas so either near the floor, or near the top, if this ws part of a building.
Damage, as said before, the details are rather random, and the cracks and chips do not make sense where i can see them. Take a think and work out where it is most likely to be damaged. Has it took a hard blow from an object? Destroying the centre coat? Have other object been knocking into it, chipping small pieces off? Is this an ancient ruin, untouched by man, but worn rom the acidic rain? This can really help sell a piece.
But, i may be over-examining this, but it is always best to squeeze as much realism, and interest as you can from every piece.
