Finally I am beginning to recognize that "feeling" when I am painting just to paint and not to create. It is a; "I don't really want to do this or just one more layer of paint will make it gorgeous or I'm going to finish this even if it kills me" feeling.
The above still life morphed into the mess at the left. Lesson learned; I am not a flower still life artist, more is not always better and give up on this one!
Don't push a painting, either it flows and you know what your next moves should be or put it away until you understand/see/feel what the painting needs to complete it.