What can be done about my asymmetrical eyebrows? (photos)

Be careful! The likely reason that your left eyebrow is higher is because it is compensating for a droopier left upper eyelid (ptosis), so it is a compensatory mechanism. The solution would be left upper eyelid ptosis surgery, not brow surgery.  Your left upper eyelid may not look droopy since it is being lifted by the eyebrow.  See an oculoplastic surgeon for evaluation.

Treatment options are either Botox injections or a unilateral endoscopic browlift on the lower side.

This is a pretty common concern and often there is some underlying facial asymmetry (that we all have!) that is responsible for this. A consultation would help so the treating physician can assess your dynamic function with movement. A little well-placed Botox can often make your brows more symmetrical. An asymmetric brow lift is a little more involved but permanent option and can achieve a more significant lift of your right brow than Botox will allow. All the best,Jason Litner, MD