portaito is an attempt to increase face variance in image generations. Essentially, you want new fresh looking faces when generating with new seeds.
Skin can be a little bit plastic looking at high CFG, try lowering it to 4-5 if it's too overpowering.
I recommend DPM++ SDE Karras, CFG 5, 30 steps.
All images in preview are generated with some variation of:
score_9, score_8_up, score_7_up, 1girl, solo, portrait, depth of field, bokeh
or
score_9, score_8_up, score_7_up, 1girl, solo, portrait, face, skin, eyes, lips