Knowing when to quit

I'm relatively new to mixed media.  I'm still trying to figure out techniques that I have seen and how to accomplish on a canvas or board what I see in my head.  There are days that I can't work on art at all because life just gets in the way.  I have to say, I tend to be a bit crabby on those days.  Just like when I don't work our or go for a run, I just feel like I'm not quite myself because I need that release of endorphins from a workout and pouring of creativity onto my current piece (or pieces).

But sometimes I have to step away from whatever I'm working on.  Taking a break allows me to look at it from a distance (usually every time I walk by!) and determine what it still needs.  I have looked at pieces for MONTHS sitting on the easel, the piano or wherever before deciding that it is done or what the final touch will be! 

And then there are times that I DON'T stop.  I just keep adding paint, paper, ephemera, sanding.  It can be a struggle to realize when it is done and when I should just put down the paintbrush!!  Other times, it is difficult to put the brush to canvas!  I'm afraid that I'll ruin what I have accomplished so far!  I look at it, I like it but I know that it still needs something.  Just not quite sure what it needs or how to give it what will help to complete it!

I am learning to trust my instincts.  If it doesn't feel right or I'm not sure, just put down the paintbrush.  If I know it needs a wash or splatters of paint, just do it!  Don't be afraid to ruin it!  I have had so many happy accidents by just going for it!  The paint may not drip the way I envisioned, it may be darker or lighter or the wrong shade but you never know until you try.  I haven't found the answer.  But following my gut seems to bring the results that I am looking for.  Such is life!