Greetings in that Divine and Most Precious Name of Our Lord and Savior Jesus Christ!
1) I adore my cat, I venerate my mother and I worship God as the source of all. Adoration is human love, veneration is a deeper sense of worship and gratitude and worship proper is where you direct such venerable gratitude. I venerate my mother because she was sent by God to bring me into the world and keep me in the world, in God's Grace. I adore my cat because she is adorable, but I hardly have worshiping sentiments about the cat. Adoration can lead to veneration, but they are not strictly synonymous, as its a matter of degrees.
2) Yes, I inherently find myself more venerable towards an Icon of Our Savior, as our Savior Himself through the Incarnation is an Image/Icon of the Infinite, Immaterial, and Immortal Godhead of the Father who we have no other was to see. Just as incense smoke gives substance to the winds of the air, so to does the Incarnation of Christ give shape and form to the Formless Father.
3) Yes, I also venerate all human beings as Christ, but this takes a bit more effort and doesn't came as naturally or easily or instinctively as does veneration of an Icon of Christ, though in truth I was raised a Baptist, so it took me a while to learn to venerate Icons too, and in time I'm sure God will teach me to venerate all humans as His icons in Christ as well, but it takes time in the Spirit. Our interactions with other Human beings are like are interactions with God because this whole of creation is God's and under God's Will, and nothing happens outside of God's Will. When we accept our realities, we accept God's Reality. So when we learn to venerate all human beings with that Christ consciousness, then we learn to see how God is always in our midst. Further, we learn to accept all of our lives as in God's hands, so its not just people we learn to accept, but all of reality as God's. Anything else is quixotic..