Properly trimming cheek hair can make your face look more defined (I speak from my own experience), the key to this is to feel your zygomatic arches and trim the hair that is above the lower edges of these bones, following their path to the corners of the mouth (where the moustache would start), this way you will highlight your cheekbones and your beard won't look artificial.
Here are some examples:


Basically you have to avoid the contour of the hair on your cheeks being very curved or too low, since otherwise it will not look natural as you can see below:



As for the length, I recommend a 10 day stubble (4-5mm), going longer than this will probably make your lower third look less angular.
Check this thread if you can't grow facial hair or if it is not dense enough to rock a stubble:
Here are some examples:


Basically you have to avoid the contour of the hair on your cheeks being very curved or too low, since otherwise it will not look natural as you can see below:



As for the length, I recommend a 10 day stubble (4-5mm), going longer than this will probably make your lower third look less angular.
Check this thread if you can't grow facial hair or if it is not dense enough to rock a stubble:
https://************/threads/an-ext...gcecls-ricemen-and-everyone-else-gtfih.43092/