Hi, I can finish this now. Thanks for voting, and sorry for the lack of attention I’ve given this thread recently. I am on holiday this week, so I haven’t had much opportunity to respond.
It looks like the majority of you got it right, it was the dark picture of the diving bird.
Things I’ve realized
As @VVruba mentioned, I think the perfect symmetry was a mistake.
I think the posing is rather boring and lackluster, I should have made it a bit more dynamic and again, less symmetrical.
I think the line between the different types of feathers are too sharp, and I thinks that looks unnatural.
The darkness makes it hard to see much, so I blotted out a lot of details on the head.
I feel like the angle is also not great, but I’m not entirely sure what would be better.
I think I put too many photos in, it probably took a long time just to look through them, so sorry about that.
If there is anything else you think I should have done differently, please feel free to tell me.