How the mark takes on the myth as animal form

Another point about marks: they take the animal form. why? 

Animals are crucial for our survival, which is why we worship them.

Here, the mark becomes a vulture, inscribed into a relief in an ancient Egyptian frieze. The vulture symbolizes protection and maternal care. 

So, the mark follows the myth. and the myth becomes decoration, which appears in temple ceilings, headdresses, cornices, armor, etc.

The scarab was considered to represent the creation of life. It appears in reliefs, amulets, decoration of columns, etc.

Horus (the falcon God) battles Seth (a dog-like animal) to become the pharaoh of Egypt (5000 BC)

who made these design decisions? the craftspeople? the priesthood?