This app is about sketch drawing how to create and design it. The model in your design is called croquis, should be drawn in the best pose to show your design. You can draw a model that runs, sits, ducks, or other positions. As a beginner, you can start with an ordinary pose, which is a runway sketch that illustrates a stand or walking model while modeling clothes. This pose is the easiest way to draw and you can describe your design in full.

In this app many images of flat illustrations of illustrations are easy to understand.
Hopefully useful
Thank you