I think cheek bone is fairly common. However,it can be rather large. Hitting that one exact place onit, I personally find to be tough. Iused to anchor there for a while, but found to be in good alignment, my drawarm was too high.I didn't feel comfortable trying to keep that "t" formwith either arm with the high anchor.

Currently, I anchor mainly with the second finger in the corner of mymouth (upper bicuspid), and my index finger below my cheekbone. I have also found my thumb to be a bit clumsy and position it so it rests ontop of my index finger. Pinky is curled in.