Why these of my photos getting rejected ?

grazie a tutti per la consulenza!

P1170185 - underexposed bulb, motion blur and a fair bit of noise

P1160989 - Sensor spots as clearly seen to the right of the cactus.  (Personally, I would have also cropped the photo differently, but that might be just my own preference / taste.)

P1160899 - Underexposed shadows, noise, sensor spots as seen below and I think having more of the food in focus would have helped too.

P1160891 - Strange artifacts all over - not sure if this is light reflections on the wet fish or if it something in your camera but all of the white artifacts are distracting.  I would have also had more of the fish in focus.

That's what I saw, I hope this helps.

-Rob

Focus and composition are issues.