the majority of my rejects were just objects (flowers) dumped on a table or a terrible portrait that lacked concept and technical aspects.

That's why the dump and snap article was crap. (whatever he called it) Sure might be good for creative and fun or learning, but it's not going to fly for micro. Years ago I made a shot of a pile of paper clips (first month in micro, looking for things around the office to shoot) I titled it pile of paperclips. The reviewer wrote a comment that things needed to be arranged, not just dumped in a heap. Funny thing is, I placed every one of those paper clips, in position, by color! 

You'll pass soon, the girl with the fish may not be perfect composition, but the content and exposure is good. I think it's a winner. Don't forget to downsize for first review...