Cheek sunken down on one side following an extraction. Can this be corrected with Invisalign? (Photo)

A missing single tooth may not be the likely cause of the cheek sinking in on one side. It could be related to cheek muscle or posture when smiling. The reason I say that is a bicuspid is only about 7mm wide and would not cause the cheek to sink in that much. I would agree it was teeth related if you said you had 2 bicuspids and a molar extracted from one side.
Invisalign will close any space left over from the unilateral cuspid extraction but may not correct the sunken cheek on your left side. Invisalign will enhance your smile and give you more cheek support if the upper arch was widened, but is it challenging to diagnise and determine this from a single photo.