when you, an artist, dismiss or complain about the quality of your own art, while presenting it to people for them to view, you are not just putting yourself down
you are putting down the work of everyone who is less skilled than you
complain about your WIPs being hard all you want, complain about your junked drawings, whatever
but if you're putting your art out there for people to see? don't. don't say things about your public work you wouldn't say to other people about theirs.