Find a location with good light for a portrait shot. Place your subject some distance in front of a simple background and select a wide aperture together with a moderately long focal length.
Leica summilux 1:1.7-2.8/10.9-34. Efl 75mm 1/125 at f/2.8.
Compressed space between subject and background and strong bokeh. This was taken with a micro 4/3 camera and the lens needed to be wide open to create the shallow depth of field. A noticeable difference to my APSC cameras.