Welcome to the forum!!!
Brow bone reduction is most popular for female feminization surgery.
Do you have brow bossing and/or a thick skull bone?
It will change the shape of your eyebrows. It will pull them up (only to sag later) and make them look tight (at first). This is a tricky surgery, and I have seen a lot of horrors over the years. It can give a very artificial/hardened appearance. Many brow bone reductions make the patient look "done", which is highly undesirable. Placement of the incision is individually dependent.