I've been fed-up with how Illustrious seems to be only capable of producing mostly flat, anime looking images and set out to create a lora that could fairly accurately represent Watercolor, Oil painting and Digital Painting art styles. Use the triggers, Traditional Media to bring out line work and details, Oil Painting to create a traditional painting style or Digital Painting for a more photoshop paint style and Watercolor for a great watercolor style. Enjoy!
Trigger word: TRADITIONAL_MEDIA, OIL_PAINTING, WATERCOLOR, DIGITAL_PAINTING
As you can see combining triggers will give different effects. Mix and Match as you see fit!