/3/ - 3DCG

>>638883
I'm no graphic designer, so this is based mostly on 'eye feeling'. But consider this alternative. I felt the brightest color a bit out of place, so I added another one to soften the transition, and also to keep a medium value, well, in the middle (your fourth). I tweaked a couple of colors slightly, too. At that point, however, I felt that the transition across the high values is smoother than across the dark ones, so I removed one high color to balance things out around the middle. This leaves again a six colors palette, which would be my pick.