Arthur, this looks like a juvenile black shouldered kite.
I posted a shot of one of these the other day
http://www.d70users.com/viewtopic.php?t=9795
I love the red eyes the adults get. amazing birds.
A nice shot but may benefit from the tighter crop on the bird.
Would love to visit wtp one day.
I have only found one place in sydney where these things are fairly regularly seen.
Steve