Here's an original way of painting your little one will probably like! You'll need:
a sheet of paper or cardboard;
gouache, a brush, a jar of water;
a pencil, an eraser;
small cups for paints dilution;
a dessert knife.
Dilute the gouache paints in the small cups. Show your little one how to take some paint with the knife edge and spread it on the paper's surface. Let your kid repeat your actions. Then offer him/her to paint a picture!
Make photos of the process, upload to the App. Write whether your kid liked this original way of painting.