Oh yes, this is a big improvement. The lizard stands out much more this time. I think Mouse's suggestion of a deeper shadow might be worth trying.
I remember you saying you wanted something that worked with circular icons. Have you tried making it circular, just out of interest? I'd be interested to see what it looked like. (I've got a circular version of my avi that I upload to places that I know use circles, but mine was easy to change).