Thanks Sheepie. Like any portrait, I try to get the eyes as sharp as I can. To me, everything else matters less.
Yes Peter, it is a water dragon. This one did stay still for a long time. I was with this fellow for more than half an hour, and saw about 8 or 9 other ones. This one was very still, I got lots of sharp images even though the photos were handheld, mostly zoomed to 300mm. Blown up large would look good. This photo at 100% is much bigger than this crop, and looks good.
Thanks for your comment mudder. I definately didn't use flash.

I very rarely use flash, and with bright daylight, I was surely too far away for any flash to matter anyway. I guess I was about 10 metres away from the water dragon.
Here's all the exif I have, disregard any info you don't need:
Image description
Artist
Copyright
Make NIKON CORPORATION
User comment
Model NIKON D70
Orientation upper left
X resolution 300
Y resolution 300
Software Adobe Photoshop CS2 Windows
Datetime 2005:09:20 18:28:33
Exposure time 1/1000 s
F-number 6
Exposure program Manual
ISO speed ratings 200
Date/time original 2005:09:20 13:56:02
Shutter speed value 0.001000 s
Aperture value 5.16993
Exposure bias value 0
Max. aperture value 5
Metering
mode Pattern
Flash No
Focal length 300 mm
Colorspace sRGB
Pixel X dimension 652
Pixel Y dimension 502