I don't mean details as in wrinkles and all that. I meant as in the shape. The caudal peduncle\tail is wrong, it's not "conical" enough and the caudal fin is too pointy. Like I said, the overall shape. You can have 6k polys or 6mi polys and still have a wrong shape.
Of course, I don't know how it sits on your scene so I'm just judging it by this proximity you show us here.
EDIT: Look at how it's supposed to be: