Hi!
I thought it was a little bit absurd that SA-MP doesn't contain some skins that are present in the gta3.img files and?most of "special" skins have only one and same movement?animation, so I thought if it was customized a little bit, then it might be better opinion as well.
I went ahead and made a list of those skins, which seems to be more reliable and better use for everyone. It is totally up to the developers of open.mp, if they wish to stick to SA-MP's own skin list or take inspiration (or rather use this) from the custom one.
https://pastebin.com/U3tw80Q6