I have found that when I get “stuck” in a cul de sac (to use a dear friend’s words), one technique to get you unstuck is time.  Step out of the work for a while (even an hour or two), leave it.  Sitting there, just looking at the canvas,  puts the “idea machine” in a loop and one finds it difficult choosing the next “road”.  However, leaving the studio, doing something else for a while, and then coming back often works.

The artist gets off the cul de sac.  Try it.