This is a question often asked nearing the end of a drawing or painting. An artist can often "overwork" a piece, well after it is finished. I know from experience.
In this, I was just about to stop when I got Rosie's face pretty close to my satisfaction and the values suitable and the stroke of the hair following the direction I remembered. I thought I was finished.
Then, I decided to add detail to the deck floor on which she was sitting. Now I wonder if I need to do the feet? Will that take away from her face? Or, should I erase some of the detail of the deck and have the unfinished shape of her paws extend over an imaginary platform? What am I trying to say to convey feelings in this "portrait" of our special pet and not disrespect?
Time to step away from this piece and give it a break for a week or so - then come back to make adjustments.