Is surgery the best option to fix this indentation between the eye brows? (photos)

What you have is an uncommon long vertical indentation between the brow bones that extends up into the forehead. The key question is whether this is caused by a bone or soft tissue deficiency or some combination of both. That would be instrumental in determining how to treat it. It would also be helpful to know how long it has been there. But treatments options are fundamentally going to come down to soft tissue injections (synthetic fill or fat) or a glabellar implant.