That is an interesting pastel that does have more going on!!
That is some killer blushing and the granite sides WoW.
Do you know what the pairing was? If not I would ask.
Hmmm. This is just a suspicion but I would bet good money on it. That may be a pretty valuable animal if you can prove it out. My bet is that the Yellow Belly is actually Gravel. http://www.worldofballpythons.com/morphs/gravel-pastel/
Or a granite pastel. Any of the loud side morphs crossed with pastel. The head fading seems like it may suggest whatever noisey side morph also lightens up the head, leading to the extreme light shading of the head.