avant-garde art was being produced (the Impressionists, most obviously); it didn't get into the official exhibitions, but it wasn't burnt in public or anything, and the artists succeeded in exhibiting it at unofficial shows, as jake says. They faced initial mockery (the word 'impressionism' was at first used as an insult) but found support and popularity really quite quickly. So don't overstate the Academy's powers.
I don't think your use of artist manqué is correct, as I've said before. And I think 'rejection' would sound better than 'refutal' (which means something like 'proving wrong').
If you're quoting Rusikin, don't include the word 'he' in the quotation because he didn't say 'he', he said 'I'. The full quote is: "I have seen and heard much of Cockney impudence before now, but never expected to hear a coxcomb ask two hundred guineas for flinging a pot of paint in the public's face."
You could write this either as "I... never expected to hear" etc or as "he observed caustically that he 'had never expected to hear' " etc.
Apart from that, it's not bad. I assume Docspock is not your tutor.