8 months post upper eyelid and temporal lift - is my lack of movement permanent? (photo)

It’s a little bit difficult to make an assessment based on the information provided. It sounds like your surgeon attempted endoscopic brow lift, and may have damaged the branches of the facial nerve that innervates the frontalis muscle. If the nerve branches were completely transected, then the chance of a full recovery is less. If there’s partial movement, then the chance of continued improvement with recovery is much better.
At this point, I suggest you consider getting some second opinion consultations from other plastic surgeons in your community.
Nerve injuries can continue to improve for 12 to 18 months
Best,
Mats Hagstrom, MD