The first seem to be focused on the shoulders and rather noisy. Possibly this is a large crop or over sharpened. It is a great moment. The second also a great moment has a yellow/green tint. The third is very good though focus seems a touch behind the head. The last is spot on. All nice photos, I'm digging in as you asked for comments. I enjoyed them all
I'd love to catch a trout like that with my pole or camera. All are excellent shots. That new camera is paying for itself with excellent results.
And isn't that what life is about; great wildlife moments captured!!
Don
Very nice set. I agree with other that 1 is quite noise and over-sharpened. #2 is a great close up if you could backup on sharpness a bit. I really love the pose and background on #3. #4 is right on. Great work.