Which weight exercises will tighten neck and shape jaw?

I'm losing weight, but my chin, neck, jaw, face dont seem to be slimming with the rest of me.  It really puts me off and really makes me want to give it all in.  My head is massive compared to my body and I hate it.  I've looked online and i'm doing the A, E, I, O, U exercises, but, it doesnt work.  Weights tighten the muscles in the body but what weight exercises can help shape the neck, jaw, and face?  I'm running alot, i'm weight lifting, but have this horrible problem and it keeps knocking my confidence.  My clothes are getting too big but my head is the same.  Any advice?