Weight 0.8-1.2

Put at the end of your prompt:

The artistic rendering employs a digital painterly style characterized by heavy grain, mottled textures, and visible brushstrokes that mimic traditional oil or gouache, utilizing a limited color palette with high contrast.

or

The artistic style is painterly with a heavy, gritty texture throughout, characterized by visible brushstrokes, scratches, and a muted color palette of dark blues, browns, and golds.