Andy,
There some nice work in here, particularly 2,3 and 4 which all have nice poses.
From a technical perspective you've suffered from using to slow a shutter speed. Looking at one of your shots, it was at ISO 220, and you were at 1/800th. When the bird is flying in or hitting the fish on the perch you really need to be pushing that shutter speed a lot higher, it will really help with your sharpness, and whilst you have produced some decent work here, the critical sharpness is lacking a bit. I may be wrong, but these look like you've pushed the sharpening slider a bit too much to compensate for the slow shutter speed.
Try pushing the ISO a couple of stops - as long as you're not cropping too heavily then your camera will breeze ISO 800 with excellent quality, and will go higher easily with good exposure and good processing.
The framing is nice, and the near eye level POV works very well, so if you can get back to this location, then I think you can get even better results next time round.
Mike