Yes. I have a note in my FAQ about what constitutes a revision.
Otherwise, I know from hard experience that people will mistake revision for rework. Having people read and understand that is harder but at least it is there and legally any reasonable person should have taken that into account. Now we just need to find a reasonable person on the internet lol
Changing the color of the eyes is a revision (more often than not). Changing the Pokeperson into an Orc With Fairy Wings is a rework as it is a whole new drawing.
If the Brief stated green eyes but red eyes were delivered, that is a fix therefore none of the above seeing the target was clear yet missed. Fixes should be without count (preferably none but we all make miksteaks).
If I know (or find) that red eyes are a bad idea, I would either a) advise early, b) include another alternate version with the eyes as I think they need to be to serve the Story (not my ego), or c) simply let them have what they want (this latter being very hard for me as I believe I am there to help tell the story not flatter the ego of the buyer seeing the story well told should be the real aim of the buyer).