Great detail on the face and the new lens is obviously doing the job! I would have cropped it tighter on the dog's face to avoid the rather distracting amount of dog's back and grass. This might have also taken the head out of dead centre. Although the muzzle and face are sharp, her ears and the top of her head are just out of focus so an even tighter crop may have worked. I am no expert (by a long way), but hope this is useful.
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