Other than rendering in the eye, I prefer to keep it as-is. If I were to add, embellish, or fix something afterwards, it will appear that way and I find it displeasing. The print no longer is a print and begins to move towards a painting. Rather than try to improve a mediocre print, I find it a much better use of time to try again and make an effort to improve my process. This is a self-imposed rule. You as the artist are free to do whatever you wish. That is the beauty of art.