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ArtStation - Monster Head Design, Anthony Hutchings | Creature design, Monster concept art, Alien concept art
These are some various explorations of the creatures head shape and mouth position. The idea is that it can dislocate / protrude its mouth similar to that of a Goblin Shark. Dislocation of the lower jaw would allow it to swallow larger prey a bit like a snake can. The hooked tentacle appendages would assist in catching and eating and help prevent prey from escaping.