Ancient writers used "likeness" when a god becomes human on earth, either in a docetist (instant) way or through childbirth.
Here are two examples for god to “born of woman” incarnation:
a) Herodotus, 'Histories', Book 7, Chapter 56 "When Xerxes had passed over to Europe, he viewed his army crossing under the lash. Seven days and seven nights it was in crossing, with no pause. It is said that when Xerxes [the Persian king] had now crossed the Hellespont, a man of the Hellespont cried, “O Zeus, why have you taken the likeness of a Persian man and changed your name to Xerxes, leading the whole world with you to remove Hellas from its place? You could have done that without these means.”
Certainly Herodotus and any other
person would know Xerxes was a man "in sinful flesh". Furthermore, the comment is
not prompted by the nature of the Persian king's body, but
because of the enormous size of his army. Anyway, it shows that
“likeness” can be used for an incarnation from a god to a “born
of woman” human being.
b) 'The Ascension of Isaiah' 4:2 “After it is consummated, Beliar the great ruler, the king of this world, will descend, who hath ruled it since it came into being; yea, he will descent from his firmament in the likeness of a man, a lawless king, the slayer of his mother: ...”
This relates to emperor Nero, who had
his mother Agrippina killed. Once again, the author used “likeness”
about the alleged incarnation of a heavenly deity to a real man.