Runes have helped me in matters of changing appearance - there are certain runic staves for weight loss, changing appearance, improving attractiveness, etc. However, you have to be careful with this too, some runic staves online can be very dangerous. I mean, you don't need to ask Satan for things you can change yourself with runes or other magic.
And in general, I think it is not constructive for a Satanist to worry about appearance, it is much more important to worry about meditation, spiritual warfare and personal progress.