My early days as an artist without means meant I would find ways to do art without much expense. After kindergarten, no one used crayons to create art. As a young man of 20, out of necessity, I created a large portfolio of crayon drawings.
My method was to layer the crayon, one color over another. Using a tool such as a stylus or even a screwdriver, I would carve the upper layers away to create the final piece.
When I finished, I placed the drawing in a hot oven for a moment to set the crayon onto the paper without melting it.
To protect the surface, I painted a layer of white glue over the drawing. This is a bit tricky because the wax and the glue do not mix, so the glue tends to want to bead. But with a little attention to the proper thickness, the glue would make a lovely satin finish, and the piece would be ready to frame.
I got so proficient at this technique that people would actually pay to watch me work.