Much better... three views of a white box with 'Access Denied' wasn't all that interesting.
1. Good capture of the dragonfly. I'd considering cropping as much of the image as you can to concentrate the eye on the insect.
2. Almost but not quite. This came very close to being a good image, but because of the bright sky, the animals are very dark and lack detail, additionally, the way they're lined up between the trees makes it quite hard to figure out what you're looking at. Unfortunately, there's not much you can do in this situation, hence the reason that wildlife photographers often spend hours hidden in blinds with very large lenses.
3. Very nice. Well framed, well exposed. This one is worth going back to and doing some long exposures (to get that feathery, flowing water effect) and perhaps some closer-up images of the smaller falls on their own.
Overall, nice work. Looking forward to more.
Just my $00.02 worth - your milage may vary.
~John