I'm not great with words, since i'm a graphic designer, not a writer but I can draw! here's what Duckhntr is saying (hi dad)
(excuse the drawing, it's hard to do stuff like this on a laptop... pretend this is the front of your duck:oops: )
the bird's down foot should be under the head, not off to the side, since he's balancing on one foot. the trick is, a body needs to keep it'spoint of contact with the ground centered with it's head to keep it's equilibrium. if a figure has two feet (or hands) on the ground, it's head will be found directly between them if you look at a crosssection of the figure. if it has one foot on the ground, then the head will be centered between that (meaning that it'll be right above it.)
I hope this helps.