Mercury's not hard to see. Even on the smaller pic she could be picked out easily. Rockslide isn't as fluid as she is, considering, well, he's a rock. A big ol' rock.
And Dust's neck isn't twisted 180 degrees. Her hand is drawn incorrectly. Well, I think so. I don't think that's her backside, and I think she's twisting (meaning it should be her right arm and we shouldn't be seeing her fingers), but I suppose I could be mistaken. Though, I suppose if I'm wrong, and that is her backside, her neck isn't drawn wrong. I can turn my head far enough to make that pose work (well, more or less). Not good for everyday practicality, but great for a pose! And the "more or less" works, because I don't think anyone's ever described Ramos as a realist when it comes to his work.