As God's image-bearers we have been commissioned with two responsibilities: to steward the resources of the Creator in His Creation, and to represent the King in His Kingdom. The ancient cultures understood what it meant for a king to have an "image." It was a constant reminder of the king's presence.
Although sin has now corrupted our ability to fulfill these functions, and has destroyed our relationship to the King, Jesus' birth, sinless life, death and resurrection have provided the means by which we can be reconciled to God and fulfill our original purpose.
There are two mandates given to God's people; the first is in the Creation narrative where we are told to live as God's image-bearers (Gen. 1:26-28). The second is the Great Commission found in Matthew 28. From a Creation Theology perspective these two mandates are saying exactly the same thing: make known the work and Person of our Creator God. The New Testament emphasizes the spiritual reconciliation now made possible through Jesus' sacrifice.