Awesome! Those renders look like a scene from World in Conflict. :) http://pcmedia.gamespy.com/pc/image/article/779/779951/world-in-conflict-20070411062142759-000.jpg or more specifically the X-Mas map:
If you want people to actually see your work I would suggest you save your work as jpeg. Your first image is a 120 meg png file. No one is going to wait for that to load.
Guilty Gear baked vertex normal from a simpler mesh. Give it a try if Blender toon shade can pick that up. http://3.bp.blogspot.com/-kIFTNf68_YU/U9X6RkBS3XI/AAAAAAAAAxU/rKllj06qsA8/s1600/060.jpg
The issue was because of the brush options defaulting to 'Min strength 0.0' I've posted a video showing the solution below in case others hit this hurdle like i did. https://www.youtube.com/watch?v=YI76kMvKIKs
You'll also have to find the center point of your texture, because if you rotate it without, it will more than likely just rotate from 0,0. The center point will be half your res. of x and y.