Commissioner doesn´t like finished piece

[ikirouta-fox.livejournal.com]

I want to ask something from all you fellow artists.

What do you do or what in your opinion should artists do when they finish a commission (anything like a painting, a fursuit, a plushie) and then the commissioner says that he or she doesn´t like the piece?

I mean, this is a case when there actually isn´t anything "wrong" with the art. You completed it in fair amount of time, you followed deadlines, you followed references, but the commissioner just doesn´t like it and starts blaming you for bad customer service and being a bad artist because you did "better" commissions for others.