Epic pixel art!
A good piece of pixel art. I like the texture effect that you've created on the ground, though I would've liked to have seen the source of the light and, because of this, made this a landscape proportioned piece and had a street light behind and to the right (viewers right) of the central characters.
I like the boarder and the rounded edges in opposing corners but I would have created the piece on a transparent background so that the space beyond the rounded corners is clear but keeping the grey background in the boarders
The only other critism I have is that some of the limbs on the characters look disproportionate, for example the left (viewers left) arm of the central character with a green shirt and the legs of the zombie on the left.
There are things that have been done great here that are worth noting for example the blood coming from the back of the right zombie's head and the details on all the characters clothing so I'd say it's a piece to be proud of, well done.
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