#1 Is GREAT! Ive got a ton of humming bird pictures taken with my 500mm f/8 (wish I had a niece long fast peice of glass...all ive got is 50mm f/1.8)
Id try using shutter speed priority and shoot at 1/4000 second....that freezes the wings enough that they arent a blur...but are still blurred...it looks cool, give it a shot next time you can! Or even cooler, try 1/8000, it almost completely freezes the wings (Unless my hand was shaking....I was shooting handheld)
#2 is great, but its over saturated.
#3 is really cool...its a lot of brown in the picture...but its a cool shot.
#4 I dont personaly like it all to much, but its a prety cool shot. The look on the birds face is wierd.
#5 is great! Only suggestion is use a smaller aperture so all the ants are in focus.