You drew a crescent moon in a level 2 project. Based on it, animate the solar eclipse process. Of course, real solar eclipse will look much more amazing.
Draw a yellow flower with 5 petals. Check here to find an easier project that draws a single petal. Also check out the tutorial on drawing a single petal.
Moving objects can give 3-D depth effect called kinetic depth effect. Draw the following Stereokinetic Effect where rotating circles generates an interesting 3-D effect. Idea from https://michaelbach.de/ot/mot-ske/