Is your book written in first or third person? Because I find it’s harder to slip in descriptions about a character when it’s in first person–that’s why so many people end up writing a “mirror scene” or something cliche where they dump all of this information at you at once.
I also agree with the person above. Spreading out your description is a much better read!
Some other ideas include having people react to her in a certain way. For example, maybe earlier in the book, her mom/family member can say something like, “I wish you’d just wear that dress I bought you.” She could respond, “Pink is not my thing.” You don’t even need to go into her style at that point, but the reader already knows that she does not like wearing pink dresses.
Later, you can drop more hints: “I saw a freshman avert her eyes as I walked past. I guess she’d never seen someone with a nose piercing before.”
Or even small things like “The chains on my belt made a clanging sounds as I sat in my desk.” Or “I started yawning and rubbed my eyes; black eyeshadow rubbed off onto my hand.” Or “I was so bored; I kept fiddling with the safety pins tacked on my sleeve.”
Write the story, focusing on the plot. And find ways to slip the description in along the way, instead of focusing on the description first. A lot of famous books don’t even describe the main character that much. I’d focus on the plot first, then sneakily add in your description.