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This looks very good. I really like the colors you've used. They compliment each other and really make each other stand out.
I'm wondering if you should have veins in the red areas - maybe making them pulse as part of the animation. That would pull "nervepainresearch" more than just generic pain.
Nice Job!

Interesting thought about the veins... but it isn't vein pain and nerves are all over... you have posed an interesting question though... how to show the pain in a more... well... painful way!
thanks for the rev.