It doesn't have to be Picasso... have you not seen the ones that are a few triangles and a dot that go for 2 mill. ? Besides, just mixing the two skins together would be awful looking, someone would have to redo both the face and the dinosaur costume in the same "style" of skinning so it would look good. When I say style of skinning, I mean the individual style of making the skins that is exclusive to one person.
PixelPancake For example. He has an insanely creative and unique style which has gotten him alot of attention on Planet Minecraft. People are willing to pay upwards of 7$ for such skins, but he only charges 1$. If you wanted a permanent skin would you want it to be half baked and stolen from other people? I don't think so..