Constructive criticism is fine...no problem with the photographer reading what others thought. We just all have to have the confidence in our own work, and the understanding that not everyone will like what we do.
And if some nut doesn't like your stuff, or rips on you, who cares? He's probably some lurker maniac who doesn't even own a camera! You didn't take these photos for these other anonymous random hacks on here...you took them for yourself.
Anyway, that's my two cents. Now go ahead and rip on my photos!
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f6.3, 1/2000, 300mm, ISO400
Canon 350D, Canon 75-300mm IS USM
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f5.0, 1/100, 210mm, ISO400
Canon 350D, Canon 75-300mm IS USM