All good artists have a bias you retard. If you arent biased in making art then chances are you are just a middle of the road jack of all trades with nothing to excel at.
Artists are constantly specialized in their taste, thats why they got fans or jobs to begin with because they enjoy what they want to paint and put the effort into making their best of the subject they want to do whether its fantasy, scifi ships, pinups or whatever.
For pony artists, that means they want to do pony art and they will always be biased to that. There is nothing wrong with that, and your own bias is showing when you are expecting them to put the same quality towards something they obviously dont love and have a mild passing interest for. Assasinmonkey doesnt even really like to do humans and hes more likely to do anthro and feral ponies than anything in EqG.
Go get your own "skilled" artists who will dedicate themselves to this 3rd rate show and stop expecting people who want to do ponies to do it for you.