Engraving of Captain Nemo viewing a giant squid from a porthole of the Nautilus submarine, from 20000 Lieues Sous les Mers by Jules Verne.
Source
This image was originally featured in the Hetzel edition (1870) of 20000 Lieues Sous les Mers, and has also been featured in more recent editions (this particular instance was scanned in from a recent edition).
Public Domain. These engravings are now the public domain, since their Droit d'auteur is expired. Note: This is a French work. French law applies. France does not use the word "copyright", but a "Droit d'auteur" system. France is a party to the Convention de Berne pour la protection des œuvres littéraires et artistiques, an international agreement about copyright which was influenced by the French "right of the author" (droit d'auteur).
The two-dimensional work of art depicted in this image is in the public domain worldwide due to the date of death of its author (if it is was published outside of the U.S. and the author has been dead for over 70 years), or due to its date of publication (if it was first made public in the U.S. before 1923). Therefore this photographical reproduction is also in the public domain, at least in the United States (see Bridgeman Art Library v. Corel Corp.), in Germany, and in many other countries.
To uploader: Please provide necessary copyright information about the artwork itself.