Wrote a short critique, but then I found out I can't because I don't have premium membership. Blah. Anyway, because you deserve it, and I am in love with this piece, here you are;
In all honesty, I am the most biased person to write a critic for this, because I love ducks. Oh well.
This is a stunning image. At first I thought the "angry" faces of the ducks were off putting, but as I looked at it more, it gave the piece more drawing energy. Nearly every picture of a duck these days, and as they look like they are about to betray somebody/thing, it makes it so unique.
The triangle arrangement is easy on the eyes, as is the simple text at the bottom- Except, it should be "Quack." not "quack." But this isn't such a drawback.
The shadows give the duck a real sense, even though they are obviously computer generated/designed. The do look like cartoons, but they maintain that real-ness about them, somehow. The fact they are all on different angles is superb.