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The company originally printed and bound books, and became one of the largest German exporters of postcards in the boom years before WW1. It printed cards for many other publishers, including small and local ones, and had a standard pro-forma for ordering printing of cards. Nearly all these were view cards. Production ceased with the bombing of Dresden in WW2 and the company ceased to exist in 1944. There is an article on Stengel in the German Wikipedia.
The ST & Co logo on the card ST & Co D 22 is very likely the early logo used by Stengel; on cards sold in France a printed logo St. & Co. à D was used. H. Ostheim was evidently the agent in Paris in 1901.
The picture of Schiller appears elsewhere in several accessible places, even as a painted version in Larousse, but none take the trouble to identify the artist.