I'm sorry, but I found them disrespectful to Marilyn so that's why I declined them. While they were nice pieces of artwork, I just don't think they belong in the gallery (I don't know if the other administrators feel the same way--actually, I don't know if they're even still active.) If I had more power, I would make a separate folder for variations on Marilyn, which would include your tattoo drawings.
I hope that makes sense, and I also hope you understand my reasoning behind the declines.