What is the best treatment for my small eyes? (Photo)

To be quite honest, your brow position is quite good and lifting it further WOULD in fact give you an exaggerated, suprised look. The "size" of the eye is determined by the size of the bony eye socket, in addition to the eyelid position. So if you have a smaller eye socket, your eyes will look smaller. There is really no fix for this. Your anatomy is your anatomy.Sometimes, a droopy eyelid (ptosis) will make your eyes look small as well. Although your upper eyelid position is relatively normal, there is room to lift your upper eyelid by 0.5 to 1 mm (ptosis repair) which would make your eyes more open. Please consult with an OculoFacial Plastic surgeon (Oculoplastics) to determine if you are a good candidate for this. Virtual consultation is available if you do not have an such a specialized surgeon close to you. I've attached before and after photo of a patient who underwent ptosis repair for the exact same concern. 

I don't believe you need brow lift. You may benefit from ptosis surgery to makes more open but need more detailed personal evaluation to determine. Botulinum toxin injection may have a role too.