I've had this painting of my daughter sitting around for a couple years and I knew I wanted to crop it and make some changes. She agreed to sit for me if I let her watch a movie so she is not looking AT me in the painting. The movie only lasted a couple hours though so I didn't have time to get to a point where I was happy. The danger with reworking a piece like this is that you may lose some of the freshness associated with painting from life. But in this case I hated the portrait so much it didn't matter. It was a case of fix it or throw it away.
The original painting was 16"x20" and I cut it down to 12"x16".