Reply To: How to color a coloring sheet in InDesign

Best practice for drawing illustrations is to use layers, and put each element on a different layer.

https://helpx.adobe.com/indesign/using/layers.html

You can also send objects forward and backward on a layer, either using the Layers Panel to move the sublayer, or use the keyboard shortcuts https://helpx.adobe.com/indesign/using/selecting-objects.html

There’s a great game for getting you used to doing Beizer Curves https://bezier.method.ac/

All that in mind – when drawing with the pen tool try make the shape using as few a points as possible to the get the best result.