In response to: "I seem to remember reading in Peter and Leni Gilman's Bio of David years ago that the pose david strikes on the cover of Heroes was based on a painting in a Berlin art gallery. Can't remember which one though so if anyone does know, please post here."
- Here you go, Brett, Walter Gramatté, 'Selfportrait'.
You can find it in the Brücke museum -
http://www.bruecke-museum.de/
The album cover of The Walker Brothers' 'Nite Flights', released in 1978, had, as a sort of hommage to Bowie and Eno's work, a typeface/font similar to that of 'Heroes'.
The year after, Bowie returned the gesture with 'African Night Flights' on 'Lodger'.