Need advice/criticism on photographs- how do I improve?

I just got a Nikon d7000. Since before now I have used point and clicks, its a whole new world of photography for me. I would appreciate people commenting on/critiquing a few pics so I can hopefully improve.

Added (1). Thanks JH

Part of the over sharpening is the fact that it is HDR- five shots with exposures at -2, -0.7, 0, 0, 7 and 2 EV. Individual shots were sharp- but since the wind was blowing there was movement in between exposures resulting in the edge blur on those flowers in the foreground which, since they were more stuck out, moved more than the rest

Added (2). Thanks AK, good advice and I'll take a look at the link. I also have some portraits of my kids- both with this macro lens and a 50mm f1.4 lens- but I prefer to not post those in an open forum for obvious reasons

Your flower photography is beautiful!

You want to know how to improve your photography? DON't ask strangers to judge your work! Instead of offering technical advice they'll try to tell you what can and can't photograph (like saying not to photograph flowers Which is dumb I'm sorry) You need to photograph what you love and what interests you. If you listen to others critique you'll find yourself taking pictures of stuff you don't care about and start hating photography! Take pictures of everything that interests you.

Read about the top 10 rules of composition, read up about photography and what makes a good photo (focus, depth of field etc) then you judge your own photos for yourself.photography is to subjective to get a real unbiased opinion from strangers. If someone isn't interested in the subject matter, they'll tear it apart for that reason alone and not take in great technical factors into account. If you're going to ask for advice find someone specifically on Flickr or what not and have them help you that has experience in that particular area and give more specific advice.

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The picture where you said the flowers were blowing in the wind seems noticeably sharpened. Too noticeable editing is not good. The ones in the foreground have a black fringe that the other bunch don't have and I've seen a fringe like that come from over-sharpening an image before. Crank up your shutter speed if you want to freeze motion.

I've heard the suggestion to stay away from flower shots unless they are really standout and unique. Try experimenting with a different subjects.

EDIT:

I would really like to mention since I was criticized for discouraging flower shots by the other answerer that I'm NOT, repeat, NOT saying that you never, ever photograph another flower in your life. I like your white flower photo, too. That's not what I was trying to tell you.

If it makes you happy, yes, by all means keep doing it. I just made the suggestion because flower shots are generally considered cliche and it's what the majority people who first get a camera take pictures of.

***In short: I was just suggesting that you explore a subject that isn't so linked to beginner photography