Digging it so far. I see no 1x1 pixels, could it be one of them cluster exercises?
If it's accuracy you're going for, take a look at the head/beak, shading and proportion, and measure this to the photo.
But the neck shading needs a second look either way. Here it's flat, ref it was round. The edge highlight worsens this IMO, it's inconsistent.
BTW, you making the ocean bg? Suggested or full-out?