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.
This image was originally featured in the Hetzel edition of 20000 Lieues Sous les Mers, and has also been featured in more recent editions (this particular instance was scanned in a recent edition). The images were originally drawn by Alphonse de Neuville and Edouard Riou. They are now the public domain, since their Droit d'auteur is expired.
Footnote: This is a French work. French law applies. France does not use the notion of "copyright", but a "Droit d'auteur" system.
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