Motivation and art work

I have a totally different day job.  I teach first graders.  I've been teaching for a long time.  I know how kids act and I know what to do to teach them.  I know my strengths and my weaknesses.  Art is so different than teaching in some ways.  In doing artwork, I feel so vulnerable.  As if I have painted my heart and soul into something.  I have to push myself to share my work sometimes.  After I've painted or gone through a process with a piece, I am so happy with the piece but there is always something about the piece that I can't get quite right.  Each time I do a drawing or a painting, I figure out different things that I hadn't even thought of before.   Sometimes, I will complete a piece and not be satisfied with it.  I have to hang on to it until I can go back and figure out what I need to do to rework the piece.   It is truly a way to go and stretch yourself.