Trained on the portraits of John Singer Sargent. I used both entire pictures and close-ups of paint textures in the training images, so it does pretty good paint textures.
Prompting: "An oil painting on canvas with thick paint and visible brush-marks" will help things along. For a rougher oil sketch feel you will need to lower the guidence to 1.8.
Strength 0.35 to 0.75.