Even though this was recently solved. This could be done by using a modifier to accomplish a easier approach mostly known as (Toon Shading). As for future noticed there are threads regarding creating cartoon outlines around meshes or objects, this can be done by using (special mesh) a simple search can find you many results.
If your more comfortable with ‘Blender’ and the curve around it, consider messing around with the modifier as it’s more of a simple guide. There are some existing threads that you could take a look at. Here is a simple guide related to creating cartoony outlines around models see here: