Nice looking figures. If I were to offer a suggestion it would be in the basing. At this size you want your colors to be lighter. I'd give them a good dusty dry brush. I'd also switch to smaller scatter - use some fine grained sand. The ballast you have there looks like really big rocks to my eye.
Mark "Extra Crispy" Severin
ScaleCreep.com
DeepFriedHappyMice.com