A sad picture. It seems that this seagull is very tired and can no longer move and fly. I saw this behavior in pigeons after they ate something poisonous. There are bastard people who deliberately poison stray dogs and cats and destroy pigeons. I am extremely negative about such people and do not fully understand their motives.
Perhaps something similar happened to this seagull or she was injured. However, this causes sad feelings. She is in a beautiful place and partly merges with the environment. Half-closed eyes add an image of tragedy.
It remains to hope that with it everything will be fine.
Thank you