The sky touches a baseline and is filled with clouds and perhaps a bird or two. The baseline is not just a line at the bottom of the page, which everything drawn has to touch. The baseline is now a part of a space or plane on the paper, which is filled with drawn objects or texture. These changes in a child's visual awareness make art an exciting activity. At this age the child feels a need to fill in all the spaces of the picture.
Crayons are still good for creating detail but paint is better for covering large spaces.
One excellent activity that combine drawing and painting is crayon resist. Be sure you press hard with the crayon or pastel. Use watercolors to paint in the areas left white. The wax of the crayon or the oil of the pastel will resist the watercolor. This is the art material of choice at this age.