During World War II he served in the Wehrmacht and was captured by the Russian Army.
After the war he moved to Wolfsburg where he met his Dutch wife, with whom he had a son and a daughter.
Engels put much detail and coloration in his illustration, as can be seen in his ten pictures for the tales of the Brothers Grimm.
In 1946 Richard Engels contacted J. R. R. Tolkien for a German edition of The Hobbit and sent him two illustrations of the Trolls and Gollum, which Tolkien found "too Disnified"; Tolkien commented in particular that he disliked "Bilbo with a dribbling nose, and Gandalf as a figure of vulgar fun rather than the Odinic wanderer that I think of".
[1] In 1957 the German publishing company Paulus-Verlag published the first German translation of The Hobbit by Walter Scherf as Kleiner Hobbit und der große Zauberer in which Engels' illustrations were finally printed.