A rough sketch is created using the Flynn marker brush in Procreate at various sizes.

The rough sketch layer is set to half transparency and used as a guide to create detailed line art using the Jaeger brush in Procreate on the smallest size.

The underlying sketch layer is unselected. Flats or base colors are added using the clipping mask tool with the line art set as a reference layer.

Highlights, shadows, skin undertones, fabric textures, and other details are added layer by layer using various brushes, including default brushes and brush packs made by a few other creators.