I recently reread all of your lessons, and specifically the one where you pointed out to actually describe your Black characters as Black, and how omitting race perpetuated whiteness as the default reminded me of some character introductions in a book series I really like.
One of the 6 main characters, Cassie, is a Black girl. Through the PoVs of the other (white) characters, I noticed they don't really mention or bring up her skin tone when describing her. They typically focused more on her clothing (overalls and work boots) or her personality (kinda shy, nature lover, etc).
However I really only noticed that when she was mentioned as being Black, it was in the PoV books of either herself or the other character of color. Unless her race had some effect on the story on hand during one of the white character's PoVs, they didn’t much mention her Blackness.
Now I could be picking things out of thin air because there was over 50 books and I only reread a handful of them recently when I noticed this, and they describe her being Black more often by all the characters in the books I haven't gotten to yet. Or maybe it was somewhat intentional on the author's part to have the characters of color mention her race while the white characters grazed over it. Either way, it was interesting to me even if I am just plucking things that were merely author accidents.
Are you talking about Animorphs 😅 I mean, you don't have to do it over and over again, really. One good time is really all it takes to describe what a character's base features look like, and then after that you modify as needed for the setting and plot.