First tip never start with those dang cubes, they’ll mess you up every time, at least I’ve never used them, too time consuming. Try this go to side view add a plane turn on subsuface make sure your on wireframe view anddraw a profile by extruding vertices. draw from the top of the head to the bottom of the neck, then select a vertice from below the chin, then go to top view and shaoe a jaw. then go to side view and finnish shaping it. Your own your way, may take a bit more time, but I garrentee you the end result is so much more pleasing. Also there is a tutorial I saw some where on the kind of cube based modeling your doing, cant remember wher it was though. Here’s one other tip, make your indian subsurface level 1 and then prass “alt C” it’ll convert your subsurf to a mesh and leave you with the original one as well. Then try working with your new mesh.