When is it finished?

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.
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Any suggestions?