ArtStation - Renegade 3d version, Danil Solovyov
Cerberus: The three headed dog, Guardian of the Underworld, who was the 12th labor of Heracles (that's the greek name of Hercules).
Mummy by Jayjiwoo Park on ArtStation.
Walking Ent by TyphonArt on deviantART
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ArtStation - -, Kim Eun Kyoung
Another pic that inspired the Executioner. The helmet was also used for the Black Hand: