Colossians 1:15

They who have experienced in themselves "redemption" (Col 1:14), know Christ in the glorious character here described, as above the highest angels to whom the false teachers (Col 2:18) taught worship was to be paid. Paul describes Him: (1) in relation to God and creation (Col 1:15-17); (2) in relation to the Church (Col 1:18-20). As the former regards Him as the Creator (Col 1:15-16) and the Sustainer (Col 1:17) of the natural world; so the latter, as the source and stay of the new moral creation. image--exact likeness and perfect Representative. Adam was made "in the image of God" (Gen 1:27). But Christ, the second Adam, perfectly reflected visibly "the invisible God" (Ti1 1:17), whose glories the first Adam only in part represented. "Image" (eicon) involves "likeness" (homoiosis); but "likeness" does not involve "image." "Image" always supposes a prototype, which it not merely resembles, but from which it is drawn: the exact counterpart, as the reflection of the sun in the water: the child the living image of the parent. "Likeness" implies mere resemblance, not the exact counterpart and derivation as "image" expresses; hence it is nowhere applied to the Son, while "image" is here, compare Co1 11:7 [TRENCH]. (Joh 1:18; Joh 14:9; Co2 4:4; Ti1 3:16; Heb 1:3). Even before His incarnation He was the image of the invisible God, as the Word (Joh 1:1-3) by whom God created the worlds, and by whom God appeared to the patriarchs.

— Jamieson-Fausset-Brown Commentary (public domain)