This is a great example of when not to use fill flash; it is the shadows that add the texture and give the image a sculpted look. You might wish to lighten the shaded portion of the iris.
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Thanks for the comments. I worked on the eye and reposted. I found a couple of subtle (10%) applications of the dodge tool (CS4) worked well to lighten the shadow without completely removing it. Before and after above.
Tom Keenan