tl;dr: If an amateur artist didn’t ask for critique, DON’T CRITICIZE THEM! If you’re an artist afraid of criticism, maybe think twice about posting that work publicly – maybe spend a couple more hours (or even *gasp* days) working on it until you’re fully proud and confident. If you see some worthless, unsolicited, negative criticism on tumblr art, tell the Anon to go critique Wontkins’ work instead. He asked for it. Or give the instigating artist something helpful and constructive to develop on.