My drawing in the vector format (no auto trace/copy} of the Sikorsky Ilya Muromets – the World’s First Four Engine Passenger Plane/ Heavy Bomber.
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The black and white PD reference photograph used is A Sikorsky Ilya Muromets strategic bomber, operated by the Imperial Russian Air Force in World War I.and was obtained from wikipedia with the following information:
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Sikorsky designed and flew the world’s first fixed -wing, multi-engined aircraft, the Russky Vityaz in 1913, and the first airliner, Ilya Muromets, in 1914.