Well...
#1 Really doesn't do much to me. Sorry. Wish that at least the bird's head was turned to the camera, or even better -- if the bird was doing something, like scratching, etc.. The gull is too far on the left.
#2. Water / land / sky line is too centered in the middle of the frame. I would have preferred more space above the bridge. But it is quite a nice shot!
#3. This is probably my favourite of the set. Nice "depth". Square format might work better? However, this shot (on my monitor) seems to lack "oomph"
, which can be quite easily added using Levels or Curves tool in an image editing program.
OK work overall. Keep practising, shoot a lot and after a while (not hours -- but weeks or months) and you will gradually find yourself taking better pictures. Learning to use image editing programs helps, but getting a good "base" shot is best.