Look closer. The 'look down' pose of the helmet is classic ROTS. Single solid black paint job.
Then there's the cape chain. ROTS has it attached to the chest armor, and settling on the back, as in the print here. In ESB, Vader didn't have a cape hook on the armor, it was shorter, pulling the cape closer together on the front and usually hidden under the neck of the facemask.
As well, In the print, the neck of the facemask is UNDER the chest armor, as in ROTS. In ANH, ESB and ROTJ the helmet and facemask sat on top of the armor.