Large jaw size can be contributed by the fats, muscle and bone in the area. A reduction in any of these component will achieve a sharper and smaller jawline. Frequent chewing and jaw grindiing can result in enlargement of muscles in the jaw. This is know as masseter hypertrophy. Muscle relaxant (botox) can be used to reduce the bulk of masseter muscles.
If fat is the contributing factor to cubby lower face, fat melting method via mesolipolysis, face laser lipolysis are options to consider.
Combination of nose enhancement, chin filler and jaw reduction will gives the best result of V Shaped face.