I don't know either, but PJ checker says this only has 15 colors.

http://hivemind.in/pj/specs/index.php?urls=http%3A%2F%2Fwww.pixeljoint.com%2Ffiles%2Ficons%2Ffull%2Fprivatedetective.gif

So does GraphicsGale.

No problem to edit, until the deadline (or again after the voting is over). Just edit, don't resubmit.

I don't know what the missing color is but I'm sure you can put it to a more creative use ;)

 Reminds of ''Deja Vu'' a nes game where you're a P.I. Nice atmosphere, well done.

@Manupix - Thank you. This is my failed attempt to avoid 'en face' and make head rotated ever so slightly to one side.

@TombReaper - Is it too late to edit the piece and re-submit? Also, is it cheating if I sign my name in missing color? :)

Well, I believe you have to use every color on the palette.

Pretty cool piece =)

The face is slightly lopsided though, looks weird once seen.