The issue with the domain is that it is not directly the phrase, I don't ever recall hearing someone say "stock picture." I've only ever heart it as stock images, stock photos or stock photography. Furthermore its a .net, that is poison to a domain. If it were stockpicture.com it would be a premium domain.

Originally Posted by jareso I have another additional question if you don’t mind. And how do you see possible future worth of such domain? (I mean without project <– only possible future worth of domain name itself.) Thank you for your opinion(s).

I don't see it increasing with time. .net domains will never become popular and that is the main factor in this domain.