This is one of the first things children learn with us if they are about 3 years old (pre school, at the age of 4 primary school starts). From the age of 3 years old year after year for we see the same jars being painted and I wish there was some improvement like how yours look.
I noticed you rare not very active and hope you are alright. I like the colour blue you used and wonder about the paint used.

I wish you a colourful day.