OK - I'll bite. I can talk about the bird pics. Someone else will have to talk about the landscapes, an aspect of photography about which I know nothing and at which am, generally, rubbish (although they are over exposed). The bird pics are soft, but I'm not sure if it because they are out of focus or just soft. I looked at the exif of those images earlier. You're using a 300mm lens, but the shutter speed is too slow, so I'd suspect camera shake and a bit of focus issue as well. General rule of thumb is that your shutter speed should be the inverse of the lens length, so, so for a 300mm lens, you should be looking at a shutter speed of at least 1/300 sec. Given the crop of most digitals, I'd add a bit too, so try for 1/400 secs for your 300mm lens.
Also, from your exif, it looks like you shot in fully manual mode. The more experienced here may flame me for this, but I'd be tempted to use either AV mode (ie aperture setting) or TV mode (ie shutter speed) depending on what you're doing. And for you, I'd favour TV, especially with that lens. If the pics are too dark, then increase the ISO. Its what I do.
On a positive side, I think your framing and general eye for a pic is spot on. The duck, in particular is really nice from that point of view - you've got the eye in focus and a bit of a catch light there too - which is what most people will say is what's required.
Keep at it. Its worth it. Bookmark this thread and come back here in a year's time. Then see how things have changed.
Hope that wasn't too brutal, but its supposed to be helpful. I'm not perfect either.
MV