He has a couple of bottom teeth and a gap between the front teeth in that 1st photo.
That marijuana really did a number on him or his writing did not pay enough to go to the dentist.
FTA: George Clayton Johnson cowrote the science fiction classic “Logan’s Run”
He wrote: then Jenny Agutter will take her clothes off repeatedly for no apparent reason.... : )
Not that there's anything wrong with that.
It worked for me!