Here are some activities you could try:
Collage a layered picture
Rousseau’s paintings seem to be made up of many layers, mimicking the layers of plants and trees in the rainforest. One way you could create a Rousseau inspired picture could be to cut out trees, plants, flowers, and animals from a magazine – or draw them and then cut them out – then start to arrange them on your paper to create a jungle scene. Using bits of paper, rather than trying to paint the picture, means you can move your trees and animals around to create the perfect composition (the way things are arranged in a picture). You can play with the animals – can you make them peek from behind a leaf? or hide behind a tree? When you are happy with it you can stick it all down.