Concerned about the results from recent blepharoplasty. 9 months post op, external eye crease seems tired and unnatural

There's excess skin in the external corner, and a sagging curve of the skin as a result of surgery; more heaviness in the int. corner and along the arch of the eye. The ext. side skin towards the temple looks shallow where it was once plump. All this seemed no issue to the surgeon. I asked him if this could be previously existing ptosis. He denied that, asked me to wait 6 months and suggested to fix with a revision op, but I still don't know what has happened or how easily/nicely fixable this is