You live in a part of the world that has many beautiful birds and interesting animals. I spent a month working outside Sydney a few years ago and marveled at the birds I saw. I live in the Northeast section of the US and I can only see birds like that at the zoo. So I can see why you are frustrated that your photos aren't up to your standards. As Joseph mentions above you really need a longer lens. Your photos of the small birds look to be in focus but most of the resolution is lost due to the very large enlargement and cropping. The AFS 18-200mm lens just can't hold up to 100% enlargements from a D7000. My best bird photos are with a 560mm manual focus lens. I never go lower than 400mm. And I still have to crop.