The Wedding Present's single "Nobody's Twisting Your Arm" has a
striking picture on the front:
http://web.inter.nl.net/hcc/C.A.Severien/images/sleeves/nobodys.gif

Where did the picture originally come from? Is it a film or something?

I can't answer this question fully, but as a WP fan it did interest me
greatly. I can tell you it is not from a film, but is in fact an
artist's photograph.

According to the Scopitones Wedding Present/Cinerama forum:
(http://www.scopitones.co.uk/phpBB2/viewtopic.php?t=775)
"1. It's not from a movie, it is an actual photograph by an actual artist. 
2. That artist had a vaguely scandanavian sounding name 
3. the same photograph was featured in a comic or graphic novel as a
poster/print in the background of a room scene."

I have found the answer to this after thirteen years of curiosity.
Issue 6 of the _Invasion of the Wedding Present_ newsletter
republished on the www.somethingandnothing.net TWP fan website
contained the information I wanted.

The photograph was by a Swedish photographer called Pål Nils Nilsson.
He was a contributer to the famous _Family of Man_ photographic
exhibition.

Thanks are due to Martin Smith, one of the fan site administrators,
for pointing me in the right direction.