Is this a failure of my hair transplant? (photo)

I had 2000 grafts into my two corners and now, 8 months later, it all looks thin. Is this a failure of the surgery?

Certainly, if each side received 1000 grafts, then this is not reflective of such a number of grafts. I would return and see your doctor as most doctors will ‘make things right’ and redo the hair transplant assuming that you still trust the doctor