One dimension of improvement could be “did the piece I finished/delivered realize my internal vision of this piece?”. In the sense that when you are executing a

One dimension of improvement could be “did the piece I finished/delivered realize my internal vision of this piece?”. In the sense that when you are executing a work you might not feel it captures what you set out to achieve, and may know/not know what was needed to rectify that. Kind of like the old Ira Glass quote on taste vs skill.