Why not? Most of us here are graphic artists and we understand visuals more than anything else. I've signed some non-disclosure clauses in my career, but that doesn't mean I don't have other work I can't share here.
I think if you want to participate you participate fully. I hate taking critiques from people I don't know or know their background. If you want to critize my work post some of your own. That's where I stand. It's easy to critize if your work never is. Are you strickly a critic then tell us that, I think we deserve to know.
Pat Hacker, Visit Scooter's World.