Created a model with my typical bust preferences, but with a more animated look with thick lines. Primarily created to create curvy female characters, but might work for male characters.
You're free to experiment with whatever settings you want (to see if you get better results). However, these are the results I typically use, you can try starting there:
Sampling Method: Euler A (SGM Uniform)
Sampling Steps: 25, CFG Scale: 4.5
Hires.fix: 4x_foolhardy_Remacri (Upscale by 1.5)
Hires Steps: 15, Hires CFG Scale: 4.5, Denoising Strength: 0.5
Adetailer: face_yolov8n
Best quality images in Portrait dimensions (896x1152, etc)