I spent quite a bit of time practising texture painting. Here are the other two pics I was working on: a husky (for fur practice) and a cliff by the sea (for clouds, rock texture, and ocean).
The cliff was especially challenging. It looked finished to me, and then I came back to it a few weeks later and saw everything that was wrong with it.
At some point you have to call it 'finished' and move on. So, here's the husky (reference on the left) and the cliff by the sea (reference at the top, my work below).