Airliner art

Some time ago I saw an ex-Singapore Airlines Boeing 747 with some art-work on the rear wall of the upper deck. It consisted of a series of Asian scenes punched into aluminium alloy sheeting. (join the dots, style). If I recall correctly the name ‘Cheng 1974?’ was on the right panel, (looking aft).
Was this in all S A aircraft? Were there different scenes in other aircraft?
Is ‘Cheng’ famous as an aviation artist or general artist? Do these panels have any value to any body outside aviation or are they just aerosexuals memorabilia. (This last is curosity, as I don’t have the scenes). Anybody have any information on the above would be appreciated.

Thanks in advance
James