Pablo Picasso once said “It took me four years to paint like Raphael, but a lifetime to paint like a child.” Paintbrushes and colors are often favorites of children and painting activities develop many readiness for kindergarten skills. Besides drawing about a backpack, 
your child may enjoy painting about it.
One of the most important is the self-expression aspect of painting. Children are practicing communicating in images instead of words. Their choice of colors is not always the same as the real object but is important to them. Also, there is no doubt that children practice fine motor control when painting. They may use a variety of ways to hold the paintbrush as they are able. Focus and concentration develop as children work and play. They feel a sense of satisfaction and enjoy creating.
As children paint, they also experiment with boundaries. Their first painting attempts will likely be random patches of colors. Some children have a very difficult time stopping their work and end up with thick, brown puddles. But this is all part of the learning process and will help build kindergarten readiness. Is there a budding Picasso inside your child?