I think I'd zoom in on just a few of them to showcase their beautiful colors and detail. I like the idea of this. Maybe work on the focus a tad as well.
This is a brillant shot and the fact the ducks are so numerous actually adds to the branches attention rather than overpower it. would be almost perfect if one of the ducks had been picked out very sharply, like the lighter one for example (second in) bathed in light.
8 - Really llike this, nice simple tones. Criticism; perhaps an even tighter crop, cutting out the first duck, not sure. Like the angle and the reflection of the water, so any different angle would likely not have captured what you have here.
Great to get all those ducks sat like that, I like the diagonal composition.Despite the comparatively shallow DOF you didn't quite manage to knock out the distracting leaves and foliage that are between you and your subject.
a little too much shade has decreased the vibrant colours of the ducks. also, some leaves in the foreground that you should have moved out of the way before taking the picture