Dean,

Some German fighters had cartoon characters as I recall and some had playing card symbols and other characters as I recall. I do not remember seeing bombers with what we call "nose art". But they never had the immense fleets of heavy bombers either.

Value? 99% or more perished when the bombers were decommissioned and broken up. The few that survived have been redone many times. An original, un-restored piece? Mucho Dinero