I agree with the above. If you ever have cause to do a chubby mold, then I may have to try very hard to order one of my OC. Until then, though, I only just discovered your page, and these are the absolute sharpest customs I think I've ever seen.
Oh I am not the artist! I was just answering since I have asked before.
She makes the molds herself. You can see some WIP of the filly mold which are clay first and then cast with a resin type stuff. Not dense. The eyes and cutie marks are printed and the sort of....glazed? onto the sides. So you can sort of feel the edges of the paper but it is pretty much seamless. Not sure how.
The bodies are all the same and then she sculpts the hair separately and notches it in.