This is Naso brevirostris, known as the spotted unicorn among other names. Its prominent nose is actually a horn that biologists suspect it uses as a means of courtship, although it does make the fish look uncannily human in profile. That's not the unicorn fish's biggest talent though: it can also change colour to suit its mood (eg it turns dark grey when stressed).
http://fansofnature.blogspot.com
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