just used the basic diffuse, normals, and specular maps. And for rendering low poly game models, go try out marmoset toolbag, its like the best thing for presentation, and its cheap too, especially if you get it on sale, I bought mine for like 30 bucks.
I'm new in 3d ,wanted to ask you what maps did you use here and what program you rendered it with to get this kind of screens ?)