just thought of another example...
look at boris vallejo. both him and his wife are into bodybuilding, he hangs out with bodybuilders, and its glaringly obvious that he prefers women of (mainly) the muscular type.

you wouldnt phone him up and rant to him about how it upsets you that the women in his paintings are disgustingly overmuscled, and that he should paint softer types.
just leave the guy alone and let him make what makes him happy, and dont buy his prints if you dont like them.  if there isnt enough interest in his work, then either he will change his style to a more marketable one or get another job.

so to clarify, i have absolutely no problem with 'requests' or polite persuasion to make something.
but i am fed up, as i am sure many other merchants are, of being ranted at, badgered and told that my morphs are anorexic or too skinny because they dont fit someone else's ideal.