The lake is good- really good composition and framing, though it looks a little tilted to right...
On lizard... Move down, get close and personal with it

Also try using a fill flash
Dragonfly - sad but it is dead.
Generally - landscape is nearly perfect.... Animals, birds, insects etc - you wan't to show them in their natural environment and mostly alive too. On dead insects you could use a change to get amazing details, that you couldn't get on a live one. In this case on that dragonfly - i would have used a change to get a 1:1 shot of it's eyes... Look how interesting and mystical they are!