He is in a stable 4 point position, I don't know what he is shooting at, and what the foliage in front of him provides, is it high grass, he cannot go prone, is it beyond 400 meters, then not as stable a platform as one would like, but if the shot has to be taken, best case position. Not ideal except in concept. He is not ghillied up which probably makes him a designated marksman. Or he is just posing for a picture, but he is slung up in a stable position. Would it make any difference if he was aiming any other rifle?
If he takes only 1 shot, He will probably get away. If he moves away of course.
My take, which is less educated than yours with all your classes is this. I just put it out so I can be corrected if I'm wrong.
1His elbow, rather than his arm appears to be touching his knee, bone to bone equals less stable.
2. He's "hiding" behind a freaking twig that provides no cover and little cocealment.
3. Said "cover" is also a glaringly obvious place to look for the sourse of an incomeing round.
4. He's kneeling, rather than sitting which provides a more stable rest with zero loss of elevation. I was taught (perhaps erroneously) that the only reason to kneel rather than sit was if you had to move IMMEDIATELY after the shot.
5. (the obvious) He's using an AK (which I like) as a SNIPER weapon.

(and yes this was sarcasm, as I said, I like AKs)
Your feedback would be appreciated.
FQ13