These look really great, nice job.

I'd try and get the wood texture to have the grain follow the big cross beams instead of vertically, same with the windows (where the texture wraps around the sides), but that's about it. And it is certainly not critical since it is very unlikely to be seen or noticed, and if that is the case just leave it as is.

As for pricing I have no idea. Are you selling the models or are you selling the top down and iso shots to be used in a raster mapping program?