I saw a similar project on Deep Space Sparkle for second graders that I modified for my fourth grades. We learned how to draw a snake as though it was twisted around a tree branch. We made several sketches before working on the final piece. The most challenging part was not the twisting, but was making the snake wide enough to not get lost on the page. We started out with some very skinny snakes! The kids used oil pastel and watercolors to complete the project.