Mark Black’s distinction between a science, an art, and a craft: an art is a discipline that can be described only in broad principles which, while correct in themselves, are useful guidelines, not unbreakable truths. There can be no formula for great art or great music, only principles to which a majority of great music adheres. There are great songs that break every rule and a great song seems to be one that has strengths in several areas, not one with perfect 10s across the board. There can be no statement: do these 6 things and you will have a hit song! Learning to be a great musician, we ponder these artistic ideals and assimilate them, but we are a good musician long before we perfect these truths in our playing and singing, as the tenets of musicianship and art direct our thinking, creating, and growth.
If your songs can't be critiqued, please go on to heaven to leave more room for mortals. Songs are a work in progress, even after published.