Tutorial on how to paint stylized 3D renders using Grease Pencil.
This workflow is great, because it's flexible and non-destructive, so you can make changes at any time.
A developer in BCON23 talked briefly about the possibility to bake these strokes in the future. that would be so cool!
You can get most out of this workflow by using Blender 4.0+ but it also works in older versions.