A few years ago, Robin Williams had a very subtle and discreet hair transplant. He kept his current hairline at the time the same and just filled in the thinning area. His hair looks a little funky after the hair transplant because it's dyed a weird color; some kind of copper brown. But, if it were his normal hair color then it would look fine. Overall, Robin Williams was smart to not lower his hairline because he was able to make a subtle and natural looking transition.