They are all great pictures. I like the content of 5 but didn't care for the juxtaposition of something so organic as hatching, against the high gloss finished wood surface. Had it been sitting in sand or something like that, then I would have chosen it hands down.
I was torn between 2 and 6 for the same qualities, the contrast of the eyes against the rest of the animal. I thought 6 popped a little more ( no pun intended) so that is how i voted. This is really a fun part of the forum.