Oh, this is exciting! There's sooooo many youtube makeup channels so yours has to be super duper original. I would just combine two things that you really like, and add a few extra letters &/or numbers. There's some users known as JuicyStar07 and AllThatGlitters. One of the names has nothing to do with makeup, and the other is all about it... so it's really all based on preference. Hope this helps as far as inspiration!

PS - I'm terrible when it comes to makeup and would love some beauty hints. As soon as you make your channel, I'd love to sub you :) youtube.com/guitargirllll... Feel free to message me!