Lighting on Low Poly Scenes?

The pic above seems to use textures that are not just one whole(blanket) color. It looks like it has a single directional light(play with the color and intensity etc) low down on the left towards the horizon. It is "Baked"(soft shadows) with "ambient occlusion", and probably with "global illumination"(unity pro only)as well. This is my best rough guess as a starting point to creating something like in the picture.

There may be a second weak red light but I am not sure, worth trying one out in conjunction with the main light though.