Riri Williams is "Iron Heart" — one of Marvel's newest superheroes, a 15-year-old prodigy who builds an Iron Man-esque suit of armor in her MIT dorm room. Along with Spider-Gwen, Squirrel Girl, and Moon Girl, she's a character developed to appeal to young, female readers.
Marvel and one of J. Scott Campbell, one of the artists doing a variant cover, didn't quite remember that. (The art on this post is not the cover in question — that is by fabulous series artist Stefano Caselli.)
I write about the over-sexualization of teen girls, target audiences, and poor art choices at Women Write About Comics. The Campbell cover was eventually pulled after fan objections — but will the industry learn from this incident?