I Agree with DarkePhaze on the hesitancy to give a negative critique even when you do approach it in the nicest manner posible.  Some people just explode from a negative critique and suddenly see you as thier arch nemesis.  Why be in a critique group in the first place if you don't want to see the bad and the good?  If all you want is high praise give your friends the URL of the website and tell them to get names and you will have your own little fan club.   Sorry if that sounds a little bit sarcastic but it's the truth.

The other thought I wanted to address is, if you are showing at a real gallery as opposed to a virtual gallery, you are going to attract at least one art critic to the scene.   Thats the game of showing at galleries, You send out your invites to who you want to come and the gallery sends its invites out to critics and also to buyers.  They want to attract business for themselves, you are really just thier tool to make that happen.  And when the Critic writes up thier revue of the show, it's not as if you can go ballistic and scream at the critic.  That would pretty much be commiting professional suicide as by the end of the week you will have another write up about your lack of professionalism.

Ok enough chatter from me. 

Scott