What can be done for a long face lacking projection? (Photo)

It appears that your chin is both long and recessed. This is due to the steepness of the mandible. Many times this is corrected with reconstructive surgery of both jaws. A less complex way to cosmetically improve your appearance may be with a surgery to reduce the height of your chin while bringing it slightly forward simultaneously. A complete set of photos and x-rays would be extremely helpful to give you further advice.

I'd adjust your chin and cheeks most likely. The chin can be shortened and brought forward with a genioplasty or chin implant.  It's really facial feminization for the lower face. Watch my videos to learn more.  

Your lower face has a long asymmetric bit recessed chin with a high jaw angle. The combination of a sliding genioplasty that brings your chin forward but also vertically shortens it with vertical lengthening jaw angle implants would change the proportion of your lower face. Further facial delengthening can also be accomplished by small cheek implants which add some anterior cheek width. Your forehead is also long and the potential role of hairline lowering is also an option for discussion. Computer of these procedures will help you see the role each one has in changing your long face into a shorter one with more projection. 

Your facial growth oattern is vertical resulting in a steeper slope to the lower jaw along with a narrow lower jaw. This reduces the projection but also emohasizes the V shape of the face frontally. It is not a good idea to only deal with the profile chin advancement since it further narrows the face. You need to lengthen the 'back/ramus of the jaw to alter the slope and have a genioplasty to alter the height of the chin too. Quite common (see website). The result is a great jawline and facial balance.