All a matter of opinion. I personally thought Pixelaro's was good on more than a technical level, as he actually complied to the rules, and I felt he best captured an emotion without the blatant "sad tear crying" approach.
plus, i think there are at least 7 pieces that I would give a vote =\ Don't just take 5 seconds to vote, you have to examine each piece. Especially on this challenge where the pieces are supposed to actually mean something.
PS: If you think mines about happiness, you phail.
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imo