Some more contemporary images of IJN aircraft in China from Donald W Thorpe via LRA. Distant view of B4Y2 on an airfield (top) and images of G3M bombers in flight.
James F Lansdale has commented about these images as follows:
"Contemporary art and contemporary colorized photos of IJNAF aircraft over China show kumogata finishes with light green and a mustard color predominating. Others show darker green and dark chocolate brown, and still others show medium green and terracotta."
Jim points out, and I concur, that we should not assume these are all accurate interpretations by the artists of the colors actually used.
Images credit: ©Donald W Thorpe via LRA