I love my renegade eyes... I know many who paid the ridiculous fortune required for the magic "scars-be-gone!" machine (that incidentally is off-limits to a certain gunnery officer). WHY WOULD I DO THAT? My scars are my cred! You're talking to Commander Shepard, better believe it!
What about the intimidate option? That will gain you renegade points and is the ONLY way to get Tali's loyalty and still be a badass. Didn't you have enough renegade points for that? (no offence intended, of course)