Personal Project Map Tests

I am currently working on a personal project. Been playing around with the mapping part, I am quite happy with the results, but with a lack of good reference I am not quite sure about how photorrealistic it looks xD.

Testing the soot effect through spec map masking, making it brighter than the actual bricks without it. Also I am not sure if the soot's Diffuse would behave as a total Black or more greyish tone. I think there are some tests to do.