Wanted to get that link out of the way first. It’s Peter H. Reynold’s site, and the field guide is too good not to share. Check it out! The advice he gives is quite useful, like #1: Relax and make some tea. I mean, who couldn’t use some tea?
In case you’re not familiar with his work (he’s written/illustrated quite a few books), I would suggest checking out Ish. It’s the story of how a boy tries and tries to draw and throws away all his attempts at drawing a vase of flowers. His little sister, meanwhile collects his trash and hangs it in a makeshift gallery in her room. When he gets mad and her and tells her that they are all awful, she asks why. She says, they are all vase-ish.
I think the moral of the story goes far beyond a children’s book. But it is a children’s book that we can hold up to our students and say: It may not be perfect, but it is (whatever)-ish. And that is amazing. And with more practice, your -ish attempts will become even more amazing.
The site is FableVision. The advice is beyond reproach.