1600 is a bit extreme Andy. I can get away with 800 on the Minolta 5D but not 1600.
You would have been better off at iso 800, F5.6 which would have given about 1/500 sec.
Your focus is spot on so you have the makings of a 10. john We're off to see the Lizard~~the wonderful (sic) Lizard of Oz~~
Would have been nice at lower iso maybe.....I know it's tempting to up the iso just to get the shot, but if your final result is left lacking then it's not always worth it, if it's a once in a lifetime shot then that's a different matter. Nice composition and the focus looks as it was good too.
You don't take a photograph, you make it. - Ansel Adams