That's a new gull for me. Nice action image of takeoff. I like the composition because it works so well with the action. On my calibrated monitor things look a little dark, but it was nothing that the middle slider in Levels couldn't solve.
Nice action image, Thanaboon! I think you did well on the crop but I also think you could take a chunk off the end on the right and go more rectangular and it will be even stronger.
I like the action of this image and the piece of food in his mouth is really nice. Only place you weren't spot on with the sharpness was the edge of that back wing. You might try to selectively sharpen that area a bit more but it's certainly not a deal breaker. Nice wing position and good HA.
There's a corner of shadow underneath the front wing that I think could easily be lightened a bit and that would help it blend in with the rest of the bird even more. Overall, a very strong image, though!