After playing around a bit with the palettes, I'm beginning to understand Prom's hard-on for that dark cyan. Helm, yours seems to be a good deal higher key than Prom's, and the dark low-sat purple feels rather warm for a universal shadow, especially against black. Also, your greens do an odd shift from warm light, cool mid, but slightly warmer dark, which feels a bit jarring, imho. I'm playing with a slightly modified version of Prom's, with a very slightly lighter and warmer mid-green, and a less-saturated yellow, and so far it's working out nicely for a darkish forest scene unabashedly similar to Prom's example. The only color in all the palettes so far that I'm not too sure about is that garish orange.