Well just simply plugging the textures into a shader won't necessarily replicate what's in the demo image , they have different properties and tweaking them can change from one software to the next. In the case of the standard Maya shaders, the specular highlights are independent of the material's reflectivity, for example. So you have other adjustments to make. If the "cell" texture is the texture I'm seeing on the arm, then you could probably plug that into a bump slot. As for "arm_showroom_ddn", I don't know, maybe give the creator a shout.