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. 
Yh I mean personally I think they sound totally fucked. People (libs) can shout 'presentism bad' all they like but at the end of the day the people who's actual job was being a viking were fucking brutal and terrifying. Ibn Faldan's description would indicate that their society was extremely patriarchal and violent (Odin's feminine weirding ways through magic, and the similar trait being attributed to male shamans, notwithstanding). That's obviously not to say that other societies at the same time didn't practice similar or greater levels of violence, but when you read Faldan's description of a chieftan's funeral is does sound like violence (physical and otherwise) were incorporated into their social fabric in a very directly present way, both formally and informally.