I didn't really post those photos for critique, but for the purpose stated. Both of those shots are extreme crops in a merciless environment. The eagle was gone exactly 1 second later. The bear was moving fairly quickly in an area that was variously in bright light, albeit within an hour or two of sunset, and dark shade. Plus, I was shooting at the limit of my focal length. I should have used a higher aperture for that shot. The aperture was a little thin for that part of the shot. I had some room for slightly less shutter speed. Easy to say now that I don't have to keep eyes on all the other bears in the area while shooting this one.
Did I mention that one of the bears actually started for me? The bear didn't like the D5100 shutter sound. I noticed that bear after the locals started for their cars. Thankfully, the bear preferred salmon to me.
BTW, I see that you are from the UAE. Have fond memories of the UAE emissary at Mayo Clinic in Rochester, MN. Never really knew his name, but we shared several elevator rides, etc.
Am trying that bear in a smaller size. Also, is your laptop screen calibrated? I just got a new calibrated monitor. Wow! What a difference. Now to get my eyeballs recalibrated next month.