Hairline will be minimally alter
The most important question is why are you thinking in this procedure? Of course the only way to give you a honest opinion is with a real consultation, however looking at your pictures it appears the your brows position is correct or high, and they do not show hyperactivity of your frontalis muscles.
Be sure that you see a board certified plastic surgeon, a member of the American Society for Aesthetic plastic Surgery assure you of board certification and specialization in cosmetic surgery.
Endoscopic browlift candidate
The photograph shows asymmetrical eyebrows with the right eyebrow slightly lower than the left, and a very high hairline. You do not have significant brow ptosis. When raising the eyebrow 1 cm, the hairline must go up 1.5 cm due to the stretch on the skin. In patients that have a high hairline, we perform a pre-trichial incision to lower the hairline when raising the eyebrows. For many examples of brow lifting in our practice, please see the link below
Brow lift options
An endoscopic browlift can raise the hairline to a variable degree. In general, if there is a high hairline to begin with it can appear too high, and the procedure is more difficult and less predictable with high hairlines. In those instances I prefer a hairline incision for a subcutaneous approach. Your hairline appears high already and you don' look like you need a browlift now anyway!
Typically, an endoscopic lift WOULD raise your line more than "a few millimeters". Your hairline is high and I probably would choose a different approach if I were seeing you. Of course, only if I thought it was appropriate. I don't see your eyebrow position as high. Perhaps you have extra fat and maybe eyelid skin partially covering your upper lids and you actually want to see more upper lid rather than raise the brows????