Okay i don't know if anybody has gotten that online skin builder to work yet but going at it another way
what do y'all think about making a PSD(or an XCF) file with
1 base tone
2 mid tones
3 highlights
4 shadows
5 "features" (things like nipples and freckles)
6 Decorations (this could be multiple layers)
N notes and landmark labels
i have in my files a script that can rip a folder of PNGs into mhmat files to make that part easy but "we" need to give the artistic folks the tools needed