Uhh... I love this, and it inspired me to draw my OC, but I realized something, when you look through a scope, you generally close the other eye so it's easier to look through.. I love it though! Proportions are gewd and all c:
Closing the other eye is actually something I was specifically taught not to do, despite how common it is. That said, that's something I was taught in Scouts as a kid; I make no claims to be a soldier or anything.
I'm no expert, but as I understand it, closing the other eye is for focusing and actually taking the shot. Both eyes should be open for maintaining situation awareness of the full area, rather than what's in your scope.