I feel like a lot of it is “translated” to match human emotions. That person wouldn’t actually be considered attractive, but the movie makes them attractive in a weird way so humans can relate. Green lipstick on a Vulcan would be EXTREMELY off putting to a human, in literal stark contrast. To make a Vulcan “attractive” it would be on human terms with our sexy red lipstick or… it may have the wrong effect and not tune emotions in properly to the scene. It’s a huge reason why I hated watching Star Trek with a particular individual I know. “THOSE TWO SPECIES COULDN’T BE BREEDING! THE HORMONES ARE ALL WRONG AND THEY DIDN’T DEVELOP IN THE SAME…” and on and on.
The blushing thing absolutely should be green, but I get why it wasn’t characterized as such. Friggin apes.