How can I reverse the surprised look of my eyebrows after an endoscopic forehead lift 10 years ago?

This can be done in patients that have a high forehead, undermining the posterior hairline and then moving it forward and then fixing it with fixation sutures do it. This will bring the brow forward and is done with an anterior hairline incision. It is a very effective procedure.  

It is possible to lower your hairline if you feel that your forehead hairline is significantly too high. Your picture indicates mild elevation to normal location does not seem to be the case. I would not recommend a reverse brow lift for you (based on your picture), in that it is an invasive procedure with significant scarring. Rather, I would recommend Botox injections for a period of time. Aging will self correct the Endoscopic Brow lift effects soon enough without surgery especially if you are not concerned about your hairline.

One of the reasons you feel that your eyes are prominent is because of the successful ptosis surgery and your baseline now shows a more normal open eye. I don't thin you have a surprised appearance. The asymmetry that is most noticeable to me from your photo is left lower lid lag laterally which can be corrected with a canthopexy procedure done in the office under local anesthesia. In situations like this I would seek a consultation with a board certified plastic surgeon to help you understand the risks and benefits of options available to you.

I have actually performed several of these procedures-  a hairline advancement combined with reverse browlift.  In order to make sure the hairline stays at a more anterior direction, I utilize Endotine® hooks that secure the scalp skin.