The most unique culture of men is Redguard/Yokuda. It has the least resemblance to a single real world culture. Close to Morocco but not really. If they were going to expand on Redguard they should look at “Spanish Moor” and Arabic influence. Could be cool to see in ESO. Khajiit is already covering the Egyptian (and Persian) influence, and while Redguard has some Egyptian already they could go in a different direction. I always imagine Lawrence of Arabia with Redguard.

Someone mentioned Russian influenced mankind culture in ESO, that would be very cool. Allods Online did a very good job of using Russian influence for the style.

I agree that the culture of Breton, Imperial and Nord is too easy/plain.

Also as a side note you can totally make a Redguard look like a Nord, an Imperial look like a Redguard, a Breton look like an Imperial etc. Their in game models can be tweaked to cross any type.

This kinda fits if with the topic it's more of an observation that goes along with it but I feel like men don't have a very distinct look in the game, a lot of male characters in any human like race look like they could be related somehow if not twins.
I feel like if the game just added better male hairs characters would look slightly more distinctive.
For example i feel like male Kahjiits have so many options within the game to look very distinctive all sorts of hairs and face shapes. Some may look similar but i feel like they look more distinctive then any other race.
So maybe if players had more choices they could make there human like male character look more the part therefor making that character have better culture, but that's just me looking at this topic from a different angle.