I disagree with lightening her skin as a stylistic trade off. It's common for black people to not be captured well in photos, but that's an issue with the photographer's skills, not the subject. In that sense, you should consider how you render.
Since you're working with a tone that's deeper, you might want to go about building her up with additive colors as opposed to subtractive colors, which is what we'd typically do.


This is how iridescence works. It's a diffusion of light on deeper surfaces.
Personally, when I want to convey depth among darker colors, I usually erase the ink and color in that area.



I like to shade/highlight with colors that compliment the character's undertone. I feel what user @beebutterbee suggested is an achievable balance.
With love, saying "I'm still learning" is a crutch. You're always learning, and will always be no matter what you do. You just need to hoan your artistic discipline. That will happen with the willingness to experiment and see what works/doesn't work.
Good luck with your art! <3