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I see you're getting some good use from that 500mm. Good looking set. I really like your blue shots (dragonfly, blue birds and indigo bunting).
I haven't calibrated my monitor in a while - so I may be wrong here - but the first eastern bluebird shot looks a little bright to me. Hope this is helpful.
Btw, that second Bluebird shot should be matted, framed and hung!