I've had this idea in my head for a long time and I finally got to it. I can't imagine how many people must have worked security at those old castles, but I'll bet it was super boring.
Usually I go pretty graphic and keep visible brushwork minimal for more "cartoony" stuff, but the rough wall reference I had inspired my to get a little looser and use some the newer Kyle T Webster brushes in Photoshop CC.
A lot of times when I don't have time to do personal work regularly, I get a quick sketch down and store it away. I was just going through my "To Do" folder and decided to polish this one off this weekend.