I found this image of Behemoth and Leviathan on DeviantArt by a person calling themselves PutridusCor, which seems to be the moniker for a guy named Aidan in Canada.
Behemoth and Leviathan are two enigmatic animals mentioned in the Old Testament book of Job. Some equate Behemoth and Leviathan with a hippopotamus and a crocodile respectively, others have compared them to primeval monsters of pagan mythology. This artist seems to have taken the latter approach.
Curious Christian 