Well, it was pretty flat, in terms of light. I know its all natural, but try to shoot when things are more visually interesting. I would take out the overexposed shots of the birds also...Not too attractive. Is that NYC in the background in the lake shot?
Yeah the overcast shots don't have alot of contrast... but it was all I had at the time. Essentially I am waiting for my tripod so I can take my time and get some better shots.
Just a couple of suggestions. Shoot during first and last light if you can. It's usually the most dramatic. Unless you have some kind of stabilizer or dolly, I'd stay away from the walking shots. Also stay away from the whip pans, fast, jerky movements etc.
Nature is often a difficult thing to capture. It takes time, patience and persistence.