Nobody really knows who or what Qman is. The images are ancient by internet standards. My guess is simply that he was an old pulp fiction nerd that got his hands on original art work for old book covers and scanned it and had it on a private server. Then he died and the server went down.
At this point, all we really have are the images he's labeled and marked.
But if you want a giant as fuck archive, I have an archive over 2000 images with a retrofuturistic theme.