The creative process is a cocktail of instinct, skill, culture and a highly creative feverishness. It is not like a drug; it is a particular state when everything happens very quickly, a mixture of consciousness and unconsciousness , of fear and pleasure; it's a little like making love, the physical act of love.
The truth is that no matter how many retakes you do, each will be different and that is the nature of any creative medium. There's no such thing as perfection.
Serendipity is the way to make discoveries, by accident but also by sagacity, of things one is not in quest of. Based on experience, knowledge, it is the creative exploitation of the unforeseen.
Is it an original idea? Or is it something where you're literally a creative collagist? You're taking pieces of the world that you see around you and that are inside of you and put them together in a way that you see fit.
When you accurately perceive the fluidity of things, you can also begin to perceive the constancy behind them: the creative, transformative, boundless, immutable Tao.