Nude study with standing pose

Oil on canvas
This is a three hours study I did this morning. Sometimes, or most of the times I struggle to put down my brush. I feel like the work will always need a little extra effort. Then, very often I regre what I did after. It's a constant struggle. Like this study, I really like how it looks now but somehow I'm not very happy with some details thought that I can do better. Should I move on? Or, should I continue?