Take the plate and fold the plastic sheet to a size that fits inside the plate. Now, apply some hot glue in the plate in a circular shape and stick the folded plastic sheet over it. Cut the edges of the sheet to give the remaining part a round shape.
Stick some rocks and mossy rocks around the plate using hot glue. Stack up a few rocks as shown below and fix them in place using hot glue.
Get another small piece of transparent plastic sheet. Stick one end of it on top of the rocks which we stacked up and the other end over the plastic sheet inside the plate.
Now paint light blue acrylic paint at the bottom of the waterfall. Also, I gave some white strokes on the top. Now run the hot glue over the plastic sheet from the top of the rocks to the bottom as water and squirt some glue at the bottom of the waterfall where we painted blue colour.
Complete the structure by sticking more rocks, mossy rocks, artificial leaves and plants. You can also add some flowers if you like.