I feel like this is probably the best unofficial representation of John's face that we can get of him as an adult. Or at least where he is currently in the timeline. (
4556020 red eyes, face, Halo 5, digital art, armor, Master Chief, helmet, sniper rifle, Halo, Spartans, robot, gun, soldier, video games, science fiction, Linda-058, mech - Rare Gallery HD Wallpapers
I tried to create the face of the Master Chief using the end scene from Halo 4. : r/halo
Halo 5 Master Chief Face - 1920x1080 Wallpaper - teahub.io