“You shall not make for yourself a carved image, or any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth.  You shall not bow down to them or serve them, for I the Lord your God am a jealous God, visiting the iniquity of the fathers on the children to the third and the fourth generation of those who hate me, 6 but showing steadfast love to thousands of those who love me and keep my commandments."  Exodus 20:4-6 (ESV)

"He is the image of the invisible God, the firstborn of all creation.  For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through him and for him.  And he is before all things, and in him all things hold together.  And he is the head of the body, the church. He is the beginning, the firstborn from the dead, that in everything he might be preeminent.  For in him all the fullness of God was pleased to dwell,  and through him to reconcile to himself all things, whether on earth or in heaven, making peace by the blood of his cross." Colossians 1:15-20 (ESV)

If the first commandment is about worshipping the wrong gods, the second is about worshipping the right God in the wrong way.