I'm 36 and have a mini brow lift scheduled. Am I making a good decision?

It would appear from your photos that you will be improved in the right hands by a short scar brow lift. Your plastic surgeon should be able to give you realistic expectations and give you an idea by gently lifting the skin with his fingers to show you the approximate improvement.

Irregular Trichophytic Forehead Lift for patients with a high hairline and low brows will keep your hairline where it is and hair will grow thru the hairline if properly done. The hairline can be lowered as well for those that wish it.

Excellent question. The photographs are not standardized so a definitive recommendation is difficult.Nevertheless there are some points to consider.  First, I would compare your eyebrow position as it is now (without the influence of Botox) to their position 10 or 15 years ago.  More than likely the heights are the same.So what's different.  If you look closely and notice that your temples and the areas around your eyes are more concave and hollow, respectively, then I would recommend volumizing the area with fat transfer and/or fillers.  Browlifts are necessary when there is abundant excess skin (called hooding) near the outside corner of the eye.  You do not seem to have abundant excess skin.  So in my opinion, continued Botox and considering volume augmentation is worth looking into.  I hope this helps.