If you want to make your painting of a panda eating a plant look realistic, there are a few things you can do. First, make sure the colors you use are accurate. The panda should be black and white, and the plant should be green. Second, pay attention to the details. The panda should have a round face, and the plant should have leaves and stems. Third, make sure the panda and the plant are in proportion to each other. The panda should be bigger than the plant. Fourth, add shadows and highlights to make the painting look more three-dimensional. Fifth, use a variety of brushstrokes to create texture. And finally, have fun!