Surfaces are not just textures. All vertices must belong to 1 surface. If you have a look the command reference on createmesh(), createsurface() and the addvertex() commands you will see that the vertices always belong to a particular surface. I think it looks good what you've done but obviously because you are just changing vertex colors you need it to be reasonably high poly I would have thought to get any detail looking okay.
Vertex painting
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