Hell no. Absolutely not. Nuh uh. Unless you go so hard with illustration that it’s basically a graphic novel, its best to write without assuming that people have internalized the illustration. At best, you can take the opportunity to focus more on aspects of them that are not shown by the image. The way they move, for example.
Note that this doesn’t mean you need to be hyper detailed in the first place, just include enough details to make them distinct. Hermione Granger was a main character for 7 books and her appearance was distinctive, consistent, and didn’t contain enough information to conclusively rule out her being black. I don’t think she was ever intended to be black, but any little girl with bushy brown hair and large buck teeth could qualify to play book one Hermione.
I generate AI art for my stories, and for me it’s as much an attempt to pin down what they look like in my own head so that I can write a better description as it is for the reader’s benefit.