I always liked the metal Command Squad models from 3rd Edition-- particularly the sergeant, even though he had no business being armed with a bolter in a command squad. I had him sitting in my bits box, and it occured to me he'd make an excellent Devastator sergeant.
Sergeant Quiote, 10th Squad.
And, per Vash's request, Quiote's shoulder pad bearing the Lions Rampant Chapter Icon.
Here's how I do the freehand. The Lion starts as sort of a reverse S. From the bottom of it, I bring the tail up, and about where the tail meets the body, I draw a diagonal line out to form the back leg. Then it's just sort of casually brushing lines so you get the arms and legs and the furry look. The head is the hardest part, and I've found just making three lines that meet at the left-hand point, then filling out the top and bottom lines, gives a semi-good head. Not quite the detail I'd like out of it, but it's quite small, so I suppose it works. After the basic lion is done, I highlight it a bit with Astronomician Grey.
As for drilling out the gun barrells. I've always been a bit hesitant to do that becuase I seem to mess up the weapon more often than not. I got a smaller drill bit though, so I'm probably going to try my hand at it. Thanks for the suggestion, Vash.