Photo from that page taken using a 50mm lens50mm, f/1.8, 1/45s no flash, tungsten-fluro mix etc as per next image. Object here is to demonstrate field of view and grouping with 50mm lens on APSC and effect on facial perspectives etc. This is handheld at 800 ISO - obviously with this camera in this light a 'quality' photo would need a tripod or additional (mood spoiling) lighting.
From that page using aImage: 50mm f/1.8 lens. Note1/45s.
APSC 1.5:1 crop sensor so 75mm equivalent.
Tungsten/fluro lighting mix, no flash. Manual white balance.
Note depth of field from large aperture.
Main aim here is to demonstrate acceptability or not, as the user may judge, for portraiture at this sort of range