Please Critique my photography over time

Hi there, here is the link of some of my photos. These have been taken for the past two years, most recent ones first. To me I have improved a little, but not too much. But I wanted to share this with you guys to see if you see any improvement. I have included a Poll for your ease of feedback, but words are also appreciated. Thanks in advance for your critique:
http://www.flickr.com/​photos/28137680@N04/

Honestly this works a lot better if you select a few images and post them here for specific feedback.

Improved in what way ? The subject matter is different with the first few being mostly foliage. Does choosing different (better ?) subject matter imply better photography ? Not sure. I notice you're paying more attention to composition in the later stuff, with the earlier stuff seeming more of a 'pretty ! centre. shoot !' style.

The last photo is the most interesting I'd say, especially compositionally, if that (comment) is what you're after.