Sampler: I like the Heun Sampler but it is slower than most. Steps: 30-40 CFG: 6-7 (Often use CFG 7 but 6 can look a bit pleasing/natural for photo-realistic images.) Including: "35mm photograph, film, bokeh, professional, 4k, highly detailed" gives very good skin details in portraits. I like to put the token (Bokeh) In the negative prompt to remove some blurring and improve the image.