It is important for us as parents to realize that every child is different, and each child's idea of art might not always fall under our own definitions. Encouragement and praise are necessary in order to build self-esteem in children. This includes praising all of those graphic images derived with the help of a computer, songs made up on the car ride to school, or paintings that may look more like squashed bugs to us. It is also important for us to recognize when we are pushing our children too hard to succeed. Everyone learns at a different pace.
Improvement can only come with practice.
Perhaps your child can appreciate a little constructive criticism, but many children cannot. This criticism might be all it takes to dissuade sensitive children from pursuing their talents. Excessive criticism can be detrimental to your child's psychological well being, especially in the creative arena. Expecting to produce a child prodigy might be a little unrealistic, but you never know. With a lot of encouragement and the right tools, your child could be the next M.C. Escher or Stevie Ray Vaughn.