Look, some of the folks here might think I'm nitpicking but I've finally noticed that only the irises of Dunmer are red.

Now, I'm not going to be presumptuous enough to assume anyone reading this has my opinion about the game Oblivion, but one of the most absolutely annoying things about that game was the fact that Dunmer (and elves in general) were baby-faced and had eyes that look exactly like humans.

I'm not sure if the art direction flip flopping is due to an internal problem or if somebody just flat out forgot, but last time I checked the God which presides over the Dusk and the Dawn probably wouldn't have a hard time making Dunmer eyes completely red, and that "realism" is irrelevant to a discussion about a race of elves cursed by a god.

You can make dunmer eyes completely red.

Also, when I look at screenshots, the faces of the elves seem to be more mainstream compared to oblivion and skyrim, the angle of their eyes isn-t so extreme,
You could say they look 'prettier' in tes online,
Am I right?

The screenshots appeal to the masses. You can make more TES style faces on the mer.