I love the one of the hawk making an inverted dive. It almost looks like he is trying to wring his own neck. 
I hope that you can tolerate just one more edit. I picked a white patch under the wing and did a white balance to make it neutral. Also, as far as JPG compression is concerned, instead of trying to compress and image that is the maximum allowed dimension of 1024 pixels to fit 150 KB file size limit, I would opt for making the image a bit smaller and then the need for compression is greatly reduced. In my edit, I reduced the maximum dimension to 720 KB which dramatically reduces the file size. As SwingBopper mentioned, sharpening helps an image, too. I do output sharpening using USM in one or two of the color channels after final sizing. If the image were being printed, I would apply considerably more sharpening. In addition to output sharpening, I also do capture sharpening in ACR and occasionally I will do selective sharpening as part of the post processing workflow in Photoshop.
Anyway, here is the edit of the hawk with a white balance adjustment and also some sharpening in the red and green channels for output.
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