>>608415
The Son always was is and will be God, but He was not always incarnate. It is the incarnation that allows depiction.
>>608417
The Son is the image
Colossians 1:12-16
12 Giving thanks unto the Father, which hath made us meet to be partakers of the inheritance of the saints in light:
13 Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son:
14 In whom we have redemption through his blood, even the forgiveness of sins:
15 Who is the image of the invisible God, the firstborn of every creature:
16 For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him:
>>608448
It's not that the Father is the divine essence, it's that only the Son has a human essence, unlike the Father and the Holy Spirit
I would strongly suggest reading On The Divine Images to anyone who this stuff is foreign to, it isn't very complicated when it's explained in full