That is a good result.
In my case, the fat graft pulled my lower lids down into a round shape.
I would be interested to see what he looks like when smiling - it might not look so good then. Fat grafting can harden and lump up years later (in my case, 1 year was all it took). Plastic surgeons bulls**t about it fat's inability to cause an inflammatory reaction but that's rubbish.
I would suggest Restylane with a very experienced surgeon. These will generate collagen and with repeated touch ups, you'll need less of it.