Regarding two of the GIFs, the first and second, when M is supposed to be smirking or throwing daggers at K when she is behind her in some line-up, I can't really see it. For the first I thought she was talking to H and smirking at something he said, which they've done before (I think laughing at Liam Payne in a cathedral somewhere, if that's what they were doing). The second I don't really see the daggers either. As people have said they're so slowed down it's hard to see.
Also, M's body language and facial expressions are so contrived most of the time. What she thinks makes her look attractive, innocent, elegant, demure or regal or whatever she's aiming for can be seen through and just end up making her look false.
The third GIF of Sophie catching her out preening (good word by someone earlier) was a real caught-you moment. Look how M adjusts her face and her smile and tries to project herself. She's hardly ever natural.
Same with those photos of her modelling recently in the DM - the ones standing on a staircase with her hand up by her face/hair. She did that pose twice in the photo shoot and has often done it since marrying H. I don't know what she thinks it portrays - innocence? She's so often posing you don't know when she's genuine and I think it backfired on her with the public.
She's pretty much always acting, I think. And because of this it's hard to believe she is what she portrays (unless you're an idiot).