Where is the fourth layer?

I am stewing.  That's what I call it when I am not ready to move forward with a piece.  I keep looking at the painting I started and am stuck after the 3rd layer...or am I?  Is it finished?  I thought it would be like some of my other mixed media pieces but it isn't.  It is personal and I like where it is at right now, but there is something...can't put my finger on it yet.  A friend looked at it and said, "It is ethereal."  The definition of ethereal-light, airy, or tenuous: an ethereal world created through the poetic imagination; heavenly or celestial: gone to his ethereal home.  That is where my Mom is at.

Now I am stewing on a new piece, looking at my Mom's images.