I should have worded that better. I think the portraits are good, my problem is just characters who are young looking who look old. It just takes me a bit out of the game but it's not a really big issue.
I yesterday spent more than 2 hours figuring out what causes old immortals to look young or old. I consulted with Korba, did some semi-scientific tests etc. and now can say with a lot of certainty that it is messed up:
1) if you move to like 1150 in the launcher, click on a sorceress, then go back to 1274 she will look young in a game.
2) there are some odd rules as of when people look young automatically I can't really wrap my head around. Very goddamn odd ones.