It seems that you are getting a bit of advice or suggestions here so I won't go into it specifically. Besides, I, also, am not an attorney. However, as a photographer and artist so to speak, I have read some of the copyright laws as they relate to my situation. I would suggest, checking out The Library of Congress, Copyright Office and see what the copyright laws say. One area that might be specific interested is "FAIR USE". I know that in those laws there are allowances for critique, education etc. See if there is something there that applies to you and if necessary,(might be advisable anyways, considering the work you put into your site.) Contact an attorney for some official legal guidance. My instinct and feeling is that the context in which you display them shouldn't be a problem. However, "What do I know"

Good Luck