Looks pretty cool. What's the texture resolution? What maps are you using, diffuse, spec and normal? What kind of viewport shader are you using? The moss or ivy seems to be over ridden by the normal map? Also there are some shadows that don't seem to make sense, I wonder if they're spots on the normal map?
Ok ill def rework the texture. A friend of mine said to make slight difference in each bricks shade of color which I thought is a good idea. As to answer Vig's question I am using Xioulies Shader with a Diffuse and a Normal Map applied. I do plan on adding a Spec map although I am currently researching how to do that. I…