The interest for their barbarian past awakend relatively late in the europeans. First artists were interested in greeks and romans. And when they painted barbarians, they painted them like romans in costumes.
But at the end of the 19th century there were a raising interest in nordic and celtic warriors.
Here two examples.
The first is by the british painter Edward Matthew Hale (1852-1924) and is called "After the Raid" (1892). It shows viking raiders with their human booty.
The second is by the french painterEvariste Vital Luminais (1821-1896) and is called "Norman Pirates" (1897). The subject is similar.

Shure that the vikings were interested in beautiful women and rape was a common practice. But we dont think that the booty were always naked. This is without question a concession to the art market of the 19th century (more about nude-painting in that time).
The naked booty is for the art-buyer not for the viking!!