That's so much bullshit. Even a commissioner with the crappiest drawing skills who does his first ever commission of a character has at least a text based description of what species, fur colors and patterns, what clothes, what pose he wants his character in. Also if you don't know, just fucking put the drawing on hold and ask.
I bet you're one of those stuck up motherfuckers who charge more than they're worth, are rude to the customers (you already demonstrated this) and don't ever offer corrections or accept feedback.
Kindly find a bridge and go throw yourself off it.