I'm not a Nikon man myself but the classic focal length for portraits is 80 - 100mm.
As a PBase member, I can recommend the camera search function that allows you to look up a particular product and then look through the selection of member's photos that have been indexed to that lens.
The
Nikkor 85mm f1.8 for example has nearly 6000 photos!
(mods LMK if this linking is 'pushing the boundaries')
