I recently joined a community called Envato Marketplaces. They offer 7 different marketplaces for you to sell your work. They come in different categories: Video, Sound, Flash, 3D, Web, Code and Graphics.
I was never too sure about these stock websites that allow you to buy or sell graphical items. I only found out about these marketplaces by finding a link to their birthday bundle that was offering tonnes of stuff for $20, so I snapped that up and then seemed to stick around. I’ve now had over 40 sales and 5 sales on my $50 Harley Davidson 3D model!
I’ve been part of 3D Ocean from when it was in it’s Beta stage about 4 months ago now. I’ve have seen an increase in sales on my items every month by 50% of the previous month!