This set has so many subtle strokes of genius. The fill dirt actually has the texture of pumice stone and the warm shade tones surrounding the surface rock help sell the impression that the rocks have lingering heat. There are all kinds of lava veins scarring the land and cooling rock. The volcano background reminds me of Scarlet Carpet from Joe & Mac 2. Smog would make an excellent layer 3 pair, and wavy HDMA or a translucent red/orange gradient low, fading as it gets higher, are worthy considerations to complement this wonderful set.