Good photo.
Some folks run the butt of the gun even a hair higher to keep the head forward/backward tilt level or more so level. And some cant the gun more into their face to keep the head and sights level.
Also depending on the build the support hand can go in a number of different places.
But its all in what you get used to and a lot is dictated by your body.
For me, even shooting the M14, the hand on the bottom of the mag did nothing at all to help stabilize the rifle, and actually hurt it a hair because it was a small wobble point. Fingers to the side of the mag/mag well help kill that wobble though.
IE no flames, thats a great starting picture, and if it works for you just as it is, great, but don't hesitate to try variations if need be.
