I hear from lots of my friends how crazy they think I am to let my two year old use paint independently. I do keep watch of her, but she very much has free reign. I in turn think my friends are crazy never to let their kids explore with paint especially with so many washable options out there.
Then she asked for some yellow. It was great because I didn't realize she knew her colors, but she was naming them all as she put them on the paper. She also started doing circles (a lot) this week and it was fun to see her do them so nicely with the yellow.
After yellow she asked for a little blue and green. I wanted to stop her at the yellow because I didn't want her painting to get muddy, but I resisted and let her just explore. She chose to stop before it was muddy all on her own.