I have a good friend who shoots mostly what I would describe as "common subjects ". Absolutely nothing wrong with that. If you can make a common subject look "uncommonly good " just think what you can do when you get a "better subject ". So many things affect what makes a good image, subject ,focus, light ,background ,processing ....etc. Everyone learns different, I learn mostly from doing, making mistakes and learning from them. Yes, I have had help in different areas of my photography, along with years of not so good pics. I believe progress is advanced by effort. More effort / more progress.
John