knowing when to stop

do you ever reach a point in a painting, drawing or creative project where you just have to stop working on it for fear of reaching the point of no return and ruining it completely?   i've reached that point with this painting, hopefully i'm not too late.    something still doesn't feel right with it and i'm not sure what, but i know if i keep adding things to it that i'll just ruin it.   sometimes when i think a painting is done, but i'm not quite sure,  i'll put it in a spot where i have to walk past it at different angles throughout the day until i can figure out what it does or doesn't need.   i'm going to give that a try tomorrow, and if i'm still not sure, i'm going to put it away for a few weeks and pull it back out and see how i feel about it.  sometimes a little time and space is all that is needed to give a fresh perspective on things.