This is a study after Henri Matisse's work Nu bleu IV, 1952. The original, paper clips on paper and pencil, is in the Musée Matisse de Nice in France.
Here I made a copy in Pages tools.
Import shapes from the Shapes menu, make them editable (Format>Shapes and Lines>Make editable). Then reshape them one by one to look like what you see in the Matisse. Change colour with the tools in Colour Viewer (open it with Command+Shift+C).
The first image shows the study, in the second all used shapes are selected, the third shows one of the shapes with editing points and a guide showing.