This is my own project, all of this was supposed to be real-time graphics. The poly count is low, suitable for real-time engines, so are textures. Unfortunately I didn't have enough energy to try it out in some engine so I rendered it out. There is nothing than any decent engine couldn't handle, 2 lights casting shadows and some light/ambient occlusion baked on to lightmaps. If I feel like I might force myself to create proper real-time version of this in near future.
At the end of this I was really tired of the project and I didn't pay much attention to specular and normal maps, frankly speaking, they are crap