"God is spirit, and those who worship Him must worship in spirit and truth." (John 4:24 -- Christ speaking)
Notable physical/visible manifestations of God (called Theophanies):
Various physical, apparently man or angel-like appearances in Genesis, not well-described.
Exodus:
. . And they saw the God of Israel: and there was under his feet as it were a paved work of a sapphire stone, and as it were the body of heaven in his clearness.
He also appeared as a pillar of smoke/flame
Burning Bush
Appeared in the form of an angel
As a dis-embodied hand to a poor shmuck who thought it would be OK to have a dinner party with the Temple gold dishes (during Babylonian captivity).
Various times a "light" "smoke" and the like.
Basically, His "image" is beyond our understanding, and is, at least, tri-partite.
Jesus explained this bit to the Sadduces who were trying to trip him up on marriage question. (If a widow remarries, who would she be married to in Heaven. Christ's answer: No one -- it does not work that way in heaven; you'll be like angels, who apparently work by different rules.)
How about a "spiritual" image?
Probably why "Thou shalt make no graven image"...to prevent just such nonsense as God looking like an old white male sitting on a cloud, or young ill favoured semitic male (I don't have time to track it but Jesus wasn't supposed to be pretty), or a handsome bearded young man looking skyward.