I have read articles about this subject from different sources. You get a lot of different view points from different aspects of the art world. Gallery owners have their version while artists have theirs. As a artist I had my share of rejection from galleries. After sitting all day at art exhibitions the artists will start to group together when the crowds are gone. Gallery rejection is usually one of the topics brought up after a glass of wine or two. I talked to gallery owners, art curators and it seems the answer is always the same with what they are looking for.
This was originality on my art site blog. To read the entire article; When the Gallery Says No, We are not Interested. Dealing with Rejection.