The image you show suggests that all of that stuff is drawn, so its actually not real 3d geometry that is being lit.
What you can do to emulate that look in 3d is to basically have no lighting at all, but instead use all unlit materials that have their textures put into the emissive slot. That way you can get very close to that look and all shading needs to be painted into the textures.
Hope this helps! And if you want to learn a bit about lighting, check my sig 
Cheers!