As an art teacher I can say with supreme confidence that no artist is ever 'finished' with a picture.It's just deadlines that get in the way of imagination.
Dissatisfaction is the constant companion of any artist,Master or amateur,hobbyist  or professional. Picasso very often would wake up and scrape away the previous day's work.

However others who view the work in the majority will quite often say a picture looks terrific because they haven't been privy to what was going on in the artist's mind as they were working the picture and have no idea of the artist's inner 'visualisation'.

At the end of the day sometimes less is more though.It might be a good idea to ask yourself IF you  have gone a kitchen sink too far.