For a 100-300 lens, those are pretty good!
1. I'd be tempted to crop off a good bit of the left, from just past the heron on; nothing going on there that adds to the photo, imo.
2. Nice; love the composition of this one.
3. I think that's actually a damselfly rather than a dragonfly, but still.

Beautiful colors! I'd crop it closer if you can do it without completely losing IQ.