I finally got a comment on how I can improve my photography. This was commented on by a group after rejecting one of my photos. I accept that, but the advice was:
Use a proper camera.
I appreciate that he told the truth, really I do. He noticed that I took that picture with a mobile phone, and clearly he did not approve of it. I don't mind, it's his opinion. But let's just say I have my reasons for not buying an actual camera.
But I think that I can make my pictures good, even if I took it by a phone camera. I guess I'd better try.