Personal project, high res created during one of my CGMA classes: https://goo.gl/9UX13T ; ended up taking him to game res for http://www.substancedays.com/ as a texture demo asset. The high res process you can see on Artstation here: https://goo.gl/s1NPGv
Some more stuff to dig through if you're interested!
www.twitch.tv/pavmike
https://gumroad.com/pavlovich
https://cubebrush.co/pavlovich
https://www.youtube.com/user/Pavlovich2005/playlists
http://3d.cgmasteracademy.com/instructors/michael-pavlovich.html
https://www.artstation.com/artist/michaelpavlovich
PS: my wife kept calling him "Corporal Bill", so that's what rank he gets on his sleeve!
Painter Walkthrough Cloth And Stitches
Painter Walkthrough Metal And Paint
Painter Walkthrough Skin And Rendering
Commander

Full character; took about 35 hours for the high res, which I made during one of my CGMA classes here: https://goo.gl/9UX13T ; more info on the high res process on artstation here: https://goo.gl/s1NPGv

Painter viewport wireframe render. Pretty dense dude, with 11 texture sets, but Substance Painter handled the entire thing like a champ on my old-ish laptop (specs here: https://www.youtube.com/watch?v=1l7MWah81HU )

Started with a lot of great smart materials from https://share.allegorithmic.com/ , definitely check that out for an excellent starting point

More info in the Metal and Paint video above, but basically used one of the sharpie brushes to brush the letters on, then used some alphas from Pixologic to add a little splatter and height breakup: https://pixologic.com/zbrush/downloadcenter/alpha/