To me, it looks like the claws grabbed the camera's focus. The little teeth there look sharp. You didn't say whether or not you used auto-focus or where the focal point(s) was/were. You might try one-shot manual focus with the center focal point on the head, then recompose after the camera locks focus. Or try manual focus. When I do macro, I seldom use autofocus because the camera often seems to think that something else is more important than what I have in mind. I also focus-stack macro shots where the subject isn't moving in order to get more in focus.
On another matter entirely, looking at the histogram, try to level out the large unused tonal range on the white side.