This gal, holding the AR, has gotten it right from what I can tell. Her hold is pretty good, her finger maybe is on the trigger but she appears ready to shoot, she has the gun stock up to her cheek and has not hyper-extended her cheek down to the gun stock, she is using her strong side eye to sight in the rifle, she is apparently using the sling to steady her hold. If one could fault anything it might be that her stance is off in that her legs may be right up against one another but you cannot tell for sure from the photo - so, why fault her for anything! Besides all that, she is pretty darned good looking.
This one was found at eBaum's world, here, where her pic was number 4 of 27 pics of gals with guns.
All the best,
Classic WWII Bombers
20 minutes ago