I'm actually getting "little mermaid" vibes from this (thought it was a mermaid!Azure at first lol)

and the yellow's not too bad, you could always just put a layer on top of everything else and less-yellow it with a semi-transparent brush? xD

And nice; coloring more realistically is actually pretty fun--Although [feel free to ignore this if you want, I ain't an expert ;D], I've found from personal experience, when doing painting-style (vs y'know, the more stylized anime works) is to reduce layers. Stay as close to actual painting as you can, and it's surprisingly easier lmao. If you aren't sure before changing something, copy the entire layer and put it in a "backups" folder. I've been trying to reduce layers as well, but still can't do all-in-one-layer

Usually aim for (and end up with more XD) something like this:

maybe 2-4 on top or under everything for filters/background/details/edit fixes.

highlights + more hair texture on another,

clothing(depends on intricacy, if it's simple it goes on the skin layer),

skin/eyes/base hair on one layer,

a draft,

and backups folder.

But this is just my personal preference XD