I agree on the overexposure also. Try using a background that isn't so bright to begin with...maybe mulch or dirt instead of aspen...if the white areas (highlights) are still "blowing out" (overexposed) then try some paper taped over the flash to calm the output.
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Erik Williams

fattailed geckos, western hognoses, and a bunch of postage stamps.
Contact me
www.chicagoherp.org
Chicago Herpetological Society