I have taken a version of my Jib Mix Realistic 11 model that I noticed was very good at doing painted and draw art styles and further mixed and added artistic Loras to make it even more arty.
If you want really deep visible paint/brush stokes then put "deep impasto brush strokes" and "painterly style" in the prompt.
I noticed that in portraits the subject might not look at the "camera" by default like they often do in most stable diffusion models, so if you want that to happen it is good to put "looking at the camera" in the prompt.