Nick: Your images are great. A little post processing would sharpen things up, if that's what you really want. Else, you could opt to tone everything down and make your images more soft, watercolor-like to emphasize the composition and the subjects' expressions. There are plenty of outstanding images out there that are out of focus or fuzzy. For example, check out what dawn_ds
CLICK HERE does with her images.
Okay, that said ...
I agree with Manfred's point number 3 (quoted above).
If your subject was
anything other than bird/wildlife, I would blame technique for fuzzy, soft, out-of-focus results; but, as Manfred stated, that extreme type of shooting can be affected by equipment limitations.
IMO, in this case, it's equipment limitations.
Successfully shooting birds/wildlife in focus and sharp requires some pretty heavy and expensive gear. For example, one of my favorite bird photographers, Jerry Ting, shoots with a Nikon D7100 (about $900 US) and a 400mm (about $10,000 US / about 3800 g (8.38 lb)) lens. There are less expensive, somewhat lighter-weight lenses with shorter focal lengths that can be extended by adding a conversion lens, but all-in-all we're talking about heavy weight and costs. And, don't forget, if you can't hand-hold the gear, you'll need a heavy-duty tripod, which is another expense and added weight.
That said, don't let any of that stop you from realizing your goal!
Here's a link to Jerry Ting's
CLICK HERE flickr photostream to inspire you to go forward by all means!