10 days post endoscopic brow lift and they dropped back it seems (photos)

Following the endo-brow procedure, progressive lose of swelling occurs. This will allow the brow to fall back into the planned preop determined position. If the amount of elevation was planned to be conservative then it may appear that your brows have fallen. It's unusual for the brow to fall back to their original position after brow elevation particularly in the early postop time period. You need to discuss this situation with your surgeon and see where you go from here.

The brows will not go up with time. See your surgeon now and he can reposition this if needed. 

Yes a revision NOW! Best to return to see your chosen surgeon ASAP! Revision are common with endo forehead lifts./// 

It is difficult to appreciate the 8 day photo because of your hair, but it seems the 10 day is similar to the pre-op. The endoscopic brow lift should hold its position well and is a good operation. It is possible that a suture may have ruptured if you looked good post-op and then noticed a rapid change. Continue to follow up with your surgeon to ensure that you progress as planned.
Best of luck.