Wow these are really great pictures. If I had taken them I'd have them printed and framed! Waiting to hear what lens you are using as well.
I love the trick about using a spray as well with sugar. Though lately these seem to be flocking to my garden. No good pictures myself yet, can't wait to get a macro lens though.
I'm amazed at how sharp they all are as well. And number 3 is really great considering it's flying, all I get are blurs or if I get it in focus the wings are none existent.
I love all the backgrounds as well they really make the hover fly stand out.