The only thing that I really notice is that lava should be hottest the closer it is to the vent. So the way I do my colors from hottest to coolest is yellow-orange-red-brown-black. This way, the yellow is by the vent and the black is further out. Of course this doesn't always hold true for some of that lava that kind of boils down the side of a hill where it pushes open the leading edge to spill out with more heat. This creates a lava tube so the ends of the lava tube might have some orange. The colors are good, I just think they're backwards...but that's just me. Keep up the good work.