Potential OOAK doll ideas? (Advise is encouraged!)

Hi! I want to make two OOAK dolls so have their ideas I guess? Also these would be my first ones so any advise is encouraged!

They're both Worldless ocs, first one is inspired by Old web horror and cryptidcore in general. The other one is inspired by ravecore and arcadecore, and they're both part of the same paranormal team! 

I'm thinking of cryptidcore one being a dark starfolk, while the ravecore one is a light starfolk. I haven't drawn them as yet but I already like their concepts so far.