That looks excellent. Detailed textures are really important. If you look at the full scene renders that use textures from Mapzone they are awesome. Mojoworld is pretty good just for textures as a byproduct rather than full landscapes but for me that's just because I know how to use it. It would be another story if you were starting from scratch, in fact highly inadvisable but Mapzone looks really cool. You could also create awesome brushes from that for use in 3D Coat. The point is that if you use procedural generation it means you can create different but related patterns for colour, depth, specular etc. You can't do that with photos.