I have read this on the rules of what and who is allowed to be drawn in icons by our Holy Fathers. In Exodus 20:4 Lord forbids us to depict the invisible God. Saint John the Damascene also said that we are allowed to draw only the visible and not the invisible.
Which Holy Fathers specifically forbid images of the Father and the Holy Spirit in the likeness of a dove?
Dionysius of Fournahttps://en.wikipedia.org/wiki/Dionysius_of_FournaDionysius of Fourna
The Painters Manual (ca. 1734 A.D.)
[A standard text used on Mount Athos by iconographers]
[The tradition] from whence we derive [the practice of] painting images, and worshipping them.
The painting of holy images we take over not only from the holy fathers, but also from the holy apostles and even from the very person of Christ our only God, as we showed clearly at the beginning of the book (4). We therefore depict (5) Christ on an icon as a man, since he came into the world and had dealings with men, becoming in the end a man like us, except in sin (6). Likewise, we also depict the Timeless Father as an old man, as Daniel saw him clearly. (7) We represent the Holy Spirit in the form of a dove, as it appeared at Jordan
. (8 ) We also represent the image of the Virgin and of all the saints, according them worship indirectly, not to the image itself; that is to say we do not say that this really is Christ, or the Virgin, or whichever saint it is that is represented on the icon, but the honour that we pay to the icon we accord to the prototype, that is to say to the person who is shown to us oi the icon. Since we give a different degree of worship to the icon of Christ and kiss it, the honour which we pay it we really make to Christ himself, the son of God, seated on the right hand of the throne of the greatness on high, who for us became man. And seeing him crucified on an icon we at once assess to ourselves that the son of God should have come down from the heights of heaven, and having taken on bodily form of the holy virgin, died on the cross, so that we might be freed from our sins and from the tyranny of death, and that he should have raised up Adam and his seed from the darkness of Hell, to lead him up the first into his kingdom. We do not worship the colours and the skill, as those who are opposed to our Church clearly blaspheme, the faithless and the heretics, but we worship our lord Jesus Christ, who is in heaven; for as Basil says, the honour paid to the icon passes on to the prototype. (9) Again, looking at the icon of the Virgin, we reason that a virgin woman took upon herself so much grace that she became the mother of God, before the birth a virgin, during the birth a virgin, and after the birth remaining a virgin.
Titles for the Holy Trinity.
The Eternal Father. The Ancient of Days.
The Co-eternal Son. The Word of God.
The Holy Spirit, proceeding from the Father.
The Holy Trinity, one God of all. On the cross, in the haloes round the three faces of the Father,
Son and Holy Spirit, write this: ‘Ο ‘ΩN [the Being;] for God said this to Moses in a vision, when he saw him in the bush: “I am that I am.” (2) And write it thus: put the Ο on the right side of the halo, and the Ω in the upper half, and the N on the left. (3)
Titles for the Holy Trinity, when you put the Father and the Son with open scrolls. On the scroll of the Father:
“I have begotten thee from the womb before the morning. Sit thou on my right hand until I make thine enemies my footstool.” (4) On the Gospel book of the Son: “Holy Father, I have glorified Thee on earth, and I have manifested thy name unto the men.” (5) The other: “I and my father are one. I am in the father, and the father in me.” (6)