Don't get me started.
...
Ok, I will start.

It's not exactly doable. There was a time when the standard Nord concept was this:
http://images.uesp.net/f/f1/Lore-race-Nord.png
But in this game, they're weathered, cross-eyed, blockheaded neanderthals.
You can't even make someone slightly old, but action hero-ish (like, say, Dolph Lundgren, who's a Nord in real life. Or the guy who played Thor).
Nord females actually look like standard "Valkyrie" types, but they seem to have an entirely different artist. Even the Nord female heads are bigger, for some reason. I can only guess that Bethesda's resident fool had seniority, and took control over how Nords would look. "No, no. I get to do the Nords. You all can do the rest." And now we have to deal with their stupidity and lack of talent. Because, for some reason, every single other race is great.
Of course, some people like them too. So whatever.