Snicky, thank you for posting additional pictures of Nate. For me, the typical driver's license pic or mug shot, easily blend together with all of the other "missing" person pics out there.
I think that natural, relaxed pictures help everyone get a better vision of him, especially if he's on the run. Like how he prefers to wear his baseball hat. Some guys like it low, some high. Some tighten the side of the bill, etc. The new ones also help paint a picture of his size and posture.
And to know how his facial hair grows, IF it grows. Some guys are full faced quick, others can only grow straggly hair after 3 weeks!
And what kind of style is he? Abercrombie? Hippie? Western? Athletic?
Does he have nervous, quirky or physical habits that could make him stand out? Nail biting, rubbing back of neck, stuttering, cracking bubblegum, whistling, chewing tobacco, etc.
Does he have a morning routine, like coffee at Starbucks, McDonalds, lunch at Burger King.
Did he pack spare clothes? If so, can anyone close identify certain articles that he may have taken? Again, ballcap, coat, shoes or boots. If he didn't take things, then he may be making purchases at some point.
He sounds athletic, maybe he's addicted to running and is going to sneak in jogs somehow with the stress that he's under. Certain personality types just can't stay cooped up.
His hair, facial hair and weight are going to start looking drastically different if he wants them to.
And the more time that goes by, he may slowly start to feel confident and make public appearances.