I think most doctors would recommend Sculptra for overall facial volumization. The amount of product you get and the overall effects are very nice. There are some downsides. Another great option is fat grafting. The basics of this procedure is that you do small volume liposuction in the belly or the flank, wash and isolate the fat, and then inject it into the desired locations in the face. The results are permanent, fairly predictable (as long as you inject it into the right places) and really pretty.
Web reference: http://www.drjohnbitner.com