At three months, your cheeks are not likely to get any thicker, at least for now. They will still thicken with age. So I see two options:

1. Continue to grow, and the cheeks will look fuller with more length.

2. Carve back to a circle beard and make the most of your strong growth areas, and re-try the full beard in a couple of years. There are some photos in my thread of how my beard progressed over the years. My cheeks were weak until my mid 40's.

My Beard Journey:  http://jefffsbeardboard.yuku.com/topic/25137/Finally-I-have-a-Beard
Beard and Bald Thread:  http://jefffsbeardboard.yuku.com/topic/27831/Beard-bald-head-shaved-head-or-buzzcut
Patchy Beard Success Stories:  http://jefffsbeardboard.yuku.com/topic/33742/Patchy-Beard-success-stories-Before-and-After-photos#.ViujbH7nuM8
Taming the Wild Mustache:  http://jefffsbeardboard.yuku.com/topic/30822/Taming-the-Wild-Stache#.Vj_Mh7erTIU
  
Last Edited By: Slybeard Jan 12 16 9:23 PM. Edited 1 times.