I have that trouble too. I'm glad your brought it up. I know another art
teacher that says, one never makes a mistake - she says this to the children.
I feel that is not being truthful with the kids. I try to help the kids work
through with the problem. I have other kids give suggestions. Third, I say
work on it 5-10 minutes more and if you still feel that way, you can start
again. I've also be known to say, "It's only a piece of paper, start again "
or I make a joke about that silly paper . Any other ideas? G.