Rejected photos, want to know possible reason for educational purposes.

4973: noise and DOF. A narrow DOF is accepted, but only when it makes sense. You should have taken this picture with all of the image in focus.

5016: Here too, the DOF does not make sense, but you also have these colourful reflections/sparkles:

You should also check these highlights, there is clipping here:

5005: This one is simply a bad image, badly composed, and the story does not make much sense. This would be one of the assets that I would delete without regret. Whatever you tried, it did not work. In addition you have a heavy noise level.