If it's important, you'll be giving details in more than one passage. You'll be building a picture, not painting it in one swipe.
For example, in The Expanse (the books, not the show), Corey describes the heavy battle armor worn by Bobby multiple times, even across books. Even if I could draw, I doubt I'd have all the details, and I'm sure it's not what the authors were picturing when they wrote those passages.
To put it another way, I think it's always a mistake to try to describe an existing image in words. A picture is in many ways a poor substitute for words. It just sits there. With words (that is, with our imagination) we can zoom in and zoom out, see the thing in different lighting and from different angles. Heck, we can even wear the dang thing.
Then know that the reader, no matter what you do, is going to envision it differently. I remember the first time I saw one of Tolkien's drawings of Bilbo. It wasn't what I had pictured, yet my mental image served me just fine through multiple books.
So, to put it yet another way, describe what the story needs, not what the picture needs.