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