I agree with whoever said the vampire chick, whose name is Alva, from Morthal. I do also like Irileth because of her attitude. She strikes me as a MILF type as well.
The best looking female I've seen so far is a mage that is on one of the loading screens. If you are messing around Winterhold you are bound to see it.
I think Karliah or Katariah or whatever the bloody Dark Elves name that is in the Thieves Guild end quest is awkwardly hot. I think it's her purple eyes that do me in. That and the fact that she looks 25 and is probably 100.
Since my char is an elf I was looking at Niranye the Altmer shopkeeper in Windhelm, but I'm pretty sure the game won't let me...haven't tried the romance stuff yet though so I hope I'm wrong.
You can marry Taarie in Solitude, if you're after an Altmer.
I don't expect many to understand or agree with my attraction to Eola. It's more her personality than her looks, but I'll be damned if her looks aren't great too,