Cell phones have actually helped me a lot in that sense. Working on it, taking a picture, then looking at the picture shows me in a more immediate way what's wrong with a piece.
Discussion
I have low standards for myself. I try to draw 1 piece/month for my mental health, few hours tops. I pick a subject at the beginning of the year & draw different iterations all year long. I'll occassionally throw in something that I'd focused on a previous year for an ego boost. 😅