I'd evaluate my work based on my intent. For example, a problem I've had with my drawings lately is that I rendered my figures well, but was unable to get the values dark enough. I tried a different medium and achieved the contrast and dark values I'd wanted. However, because of the medium, the amount of detail in rendering the figure has diminished.
I looked at the well-rendered drawings that needed the value punched up and the drawings with really rich darks that lacked refined, detailed rendering and had to decide what worked (whether intended or not), what didn't work, and what could be done (if anything) to improve them or to improve on whatever breakthroughs I may have achieved with the recent works.