Which CoolSculpting applicator is best for the flanks? Is it usually 1 or 2 applicator treatments for each side? (Photos)

Thank you for the question and helpful photos.  Although in-person exams are much more helpful to assess, it appears from the photos that you would likely need 2 curve applicators per flank (4 total for one session) and then the best results are seen with two treatment sessions spaced ~8 weeks apart.  So you'd be looking at 8 total cycles (4 each session). There's also the possibility that the technician used two colors to indicate 2 separate sessions. Did the practice give you an estimate? That would be most helpful in deciphering the markings.  

Based on the amount of tissue and fat, the flanks can be done as 1-2 applications per side per treatment session. It all depends on how you're shaped and the treatment plan configured specifically for you.