2. I wonder if the pectoral area is over lite or perhaps the back of the head might do with more fill light. I find I look at the most lite part of the photo as the main subject. Or you may have intended that. To much corner work as already mentioned. Still I like it.
1. Technically this is a tougher sell for me.
Again to much burning in the sides, Or ? lens vignetting.
And I agree with Hec here; Less sky and more beach and move the main subject away from centre more. Can you tell us more of the technique used here. With such a cloudy day I was thinking I should see more of the rock detail.
This is the more interesting picture for me. I feel that I can learn more from this if I knew more of the production details.
Brave of you to ask for critiques.