We've got the Triune God, but instead of being depicted as "Old Man, Adult Son, and Dove" we've got Him depicted a a trio of almost identical Jesus'.
The first figure is God the Son, Jesus Christ. He has a lamb upon His Chest to denote that He is the Lamb of God. You can also make out the marks of His Crucifixion on His Hands and Foot. His Hands are open and outstretched, emploring humanity to accept His gifts of salvation and mercy (as symbolized by the cherub finding refuge under His mantle - a universal sign of protection).
Central to the painting is God the Father, denoted by the Omniscient Eye present upon His Chest. He carries a golden scepter denoting Divine Justice while His Hand is raised in the Trinitarian blessing of Divine Providence. This image almost reminds me of the American Eagle that grasps arrows in one claw and olive branches in the other to juxtapose our willingness to go to war with our desire for peace.
God the Father demands Divine Justice, but He is tempered through Divine Providence - always looking for ways to gift grace and mercy to His wayward children.
Finally, we've got the Holy Spirit denoted by a dove. His Hands are crossed over His Heart, symbolic of a pledge to protect and love, which the Holy Spirit does through guiding the Church on Earth (shown through the little cherub grasping His mantle to follow along wherever He leads).
Then those adorable little angels that are touched by the Feet of God. Four of them, they may represent the Gospels that finally put this picture of the Triune God together for humanity. Three angels are physically touched by the Feet of God with one more (possibly the Gospel of John), feeling the purity of Christ's dazzling white gown supporting his head.
I think I'm in love with this Trinity portrayal. What magnificence!