There is a real art to doing wet-on-wet watercolor painting.
It is not the easiest technique to master but there are a few resources out there that can help.
One of these resources is my own Guide to Fifth Grade Wet-on-Wet Watercolor Painting.
I’ve put this guide together that includes photographs and instructions for seventeen individual paintings, as well as tips and techniques for creating your own paintings. It’s exactly the kind of resource I wish I’d had as I taught fifth grade.