
In Greek mythology, Proteus (Πρωτεύς) is an early sea-god, one of several deities whom Homer calls the “Old Man of the Sea”. Some who ascribe to him a specific domain call him the god of “elusive sea change,” which suggests the constantly changing nature of the sea or the liquid quality of water in general. He can foretell the future, but, in a mytheme familiar to several cultures, will change his shape to avoid having to; he will answer only to someone who is capable of capturing him.
Proteus’ name suggests the “first” (from Greek ”πρῶτος” - protos, “first”), as protogonos (πρωτόγονος) is the “primordial” or the “firstborn”. It is unknown for sure to what this refers, but in myths where he is the son of Poseidon, it possibly refers to him being Poseidon’s eldest son, older than Poseidon’s other son, the sea-god Triton.
According to Homer (Odyssey iv:412), the sandy island of Pharos situated off the coast of the Nile Delta was the home of Proteus, the oracular Old Man of the Sea and herdsman of the sea-beasts.
Song of the Sea is the new project of Cartoon Saloon (the same company that created The Secret of Kells) and it’ll be coming out in 2013.
“The story of the last Seal Child’s journey home. After their mother’s disappearance, Ben and Saoirse are sent to live with Granny in the city. When they resolve to return to their home by the sea, their journey becomes a race against time as they are drawn into a world Ben knows only from his mother’s folktales. But this is no bedtime story; these fairy folk have been in our world far too long. It soon becomes clear to Ben that Saoirse is the key to their survival.”

Poseidon.
Poseidon or Posidon (Greek: Ποσειδῶν) is one of the twelve Olympian deities of the pantheon in Greek mythology. His main domain is the ocean, and he is called the “God of the Sea”. Additionally, he is referred to as “Earth-Shaker” due to his role in causing earthquakes, and has been called the “tamer of horses”.
The name of the sea-god Nethuns in Etruscan was adopted in Latin for Neptune in Roman mythology; both were sea gods analogous to Poseidon. Linear B tablets show that Poseidon was venerated at Pylos and Thebes in pre-Olympian Bronze Age Greece as a chief deity, but he was integrated into the Olympian gods as the brother of Zeus and Hades. There is a Homeric hymn to Poseidon, who was the protector of many Hellenic cities, although he lost the contest for Athens to Athena. | http://en.wikipedia.org/wiki/Poseidon

Annibale Carracci, Venus Adorned by the Graces, 1590-1595. National Gallery of Art.

Nymph carried by a sea monster.
Tommaso Piroli (engraver), from Antiquités d’Herculanum, published by Francesco and Pietro Piranesi, Paris, 1804.
(Source: archive.org)

Cool Apkallu design that combines its three most typical appearances.

Apkallu are the Seven Sumerian Sages created by Enki to give civilization and culture to humanity. Due to the supposed time of their existence and their capacity to mate with humans, they are possibly synonymous with other ancient giants, such as the Biblical Nephilim.
They tend to be bird-headed, human, or fish-like in appearance.