SAMPLER / SCHEDULER - Guys I use dpmpp_2m/beta (Flux guidance set to 3) You can try outer like euler/beta, euler/normal (I have not tested them)

2:3 & 3:4 golden ratio Portrait does quiet well (See sample images)

The model is not perfect I will update with better images in future.

Trigger: Oil Painting style, textured brush strokes

Strength - 1.2-1.3 (I use 1.2)

All images generated are without SD Ultimate upscale or any editing. This is what you can expect on running the lora.

Happy Generation!