Sorry to comment so late, I did take a look at your image some time ago and thought I'd try an RP, just did not get the time. I am a great fan of these little creatures and photograph them any time I have the opportunity, the reason I haven't posted one yet is, they are always looking in a different direction and I find it hard to compose in such a way that my image is pleasing to the viewer.
You almost hit the jackpot here, save for the first turtle whose snout is pointing to the left and that makes it a bit difficult to crop. Here is my attempt and it's really ok if you do not like it, I am also here to learn and my "experiments" often go wrong. I did a few extra things here, apart from the crop: I reduced the saturation where I felt the colours were "too strong", I dodged as best as I could to lighten the very dark areas where there was no detail, I sharpened the turtles a tad (especially the first one, looking to the left), I burnt the cracks on the wood and the streaks on the subjects' heads, and some minor tweaks you will probably notice. Not sure if i did a good job of my RP, you be the judge. I also sharpened the turtles, hopefully not too much
Did you shoot without any support (beanbag, tripod, etc?)-just trying to understand how the wind affected the image in terms of the blur.
Try next time to shoot at various F-stops, IMHO you did not need high stutter speed since these guys don't move around that much, so I would have kept the ISO 400 and shot at F7.1. Not sure how far you were from your subjects either, so my advice is, when not sure what F-stop to use, try all of them and then see which image worked out best.