I have always found portraiture a challenge. To produce a drawing that displays the proportioned features of a human face is one thing, but to have it also convey a reasonable facsimile of someone's distinctive likeness through accurately rendered features is something quite different.
My graphite portraits tend to be highly detailed and take many hours to complete, while my watercolour portraits are built up over an hour or so over top of a quick ink or grease pencil sketch.
Honey Moon Mirror
Bubbles at Six Weeks
ink, watercolour pencil