Short version: they looked a lot more like 
than 
. Most accounts of Vikings that are contemporary of the centuries where shield-Danes and spear-Danes went "a-Viking" describe distinctly hygenic people that bathed and took care of their hair (and wore it long).
EDIT: I thought I could have a little fun with a very loosely associated Beowulf reference to Danes (and even more loose associations with Geats therein too) but I got the 
experience for doing so. 
They didn't have Hitler Youth fades with lazy and sloppy beard fusions. Period. Full stop. Stop doing that. Looking right the fuck at you too, P R E S T I G E T V. 
MFW there's yet another tv show/movie about the Norse and it's yet another action adventure and not a courtroom drama period piece about an icelandic farmer who accidentally burned down his neighbors forest while making charcoal
Charcoal burners occupied a sort of low status in medieval Europe if I understand correctly. They were necessary, but existed at the fringes of society.
Im actually referencing a real saga lol: Ölkofra þáttr or "the Saga of Ale-hood"
https://en.m.wikipedia.org/wiki/%C3%96lkofra_%C3%BE%C3%A1ttr