That's what I've read in Elements of Fiction Writing - Description, by Monica Wood. The book claims that when writing in third person limited perspective, you're not allowed to write the following: "Her brown eyes blackened with rage." This is because the narrator wouldn't think about the fact that her eyes are brown. What do you guys reckon about this rule? By following it, it seems like the writing will become quite limited (no pun intended)? I'd love to hear what you think. Cheers.