Art can have a great impact on child development. Art can be a great way for children who may have a difficult time communicating to express themselves.
Children who may not have not have the ability to speak, or say exactly what it is that they want may be able to paint a picture to depict their feelings to tell you something. And in that sense it's' great for parents to afford children the opportunity to use art whenever they can, and use different mediums. Paint, crayons, markers, it can be all sorts of things, and children might thrive on that.
Another great thing that art can do, is for older children especially ages six and seven can really be great with self confidence and self-esteem.
When you have a child that may feel down on themselves, for them to be able to paint a picture, and have this work of art they created that's their own that they can feel proud of will be a wonderful way for them to feel great about themselves, and to instill the self-esteem and confidence that they need.
So in short art can be a wonderful way for your child to be able to express themselves. To communicate nonverbally, as well as verbally because they'll be able to tell you what they've drawn, and it's a great way for them to feel proud the work that they've done, and to instill self confidence in them.