I usually try some kind of "quick fix" like switching out an embellishment, adding or taking off something. If that doesn't make it at least "good enough", then I will trash it and start over. I don't do that very often and it's difficult to pitch something I've spent time and resources on, but then again .... it's only paper.
only once...the rest I leave as is and live with it. I'm the only one who is going to know it didn't turn out the way I wanted it to. Everyone else may just think I did a crappy job which is ok, too.