By contrasting colors worn by the men, detail is given to the image. In some places their faces look up into the camera - in others only the Montana peaks of their hats are evident. War, as well as life, is a lot like that, the men who fight and die do not appreciate always exactly what they have done. Some actions are important and others not. Only the commander knows the big picture.
Historians live to dig, dig, dig into the details so that they can show what happened and why.
In the last paragraph of this section, Peter tells us that the ancient prophets who did the bidding of the Spirit were working for our benefit and that only in time did the full purpose become known, and the King of Kings revealed before a disinterested world. But for you, the Lord has granted messengers who, like Peter diligently labor to expose the incredulous story within History. And that story is the the world is passing and its glory is fading. Fading before the far greater glory of the Real King and Ruler of this and all worlds. We have a glorious King in Jesus Christ who in being revealed to you by Word and Spirit would give you the big picture so that you can email it home to those you love that they may know you have a part in eternity.