Was my donor area over harvested? It is 1 month after surgery 3500 grafts were extracted. (photos)

Your donor hair does look thin.  This could be due to overharvesting or due to telogen effluvium (shedding of hairs from remaining follicles).  If it is telogen effluvium you will see regrowth within a few months.  If not, scalp micropigmentation may help improve your appearance.

While over harvesting is a real problem of improper technique while extraction process, donor area shock loss is also a very common phenomenon. The donor sites do seem a little larger than usual. However there is a real possiblity of donor hair shedding exactly like planted hairs are shed after hair transplant. I will wait for at least 6 months after FuE extraction to confirm whether this is over harvesting or donor area shock loss. If it's donor area shock loss, all areas will be covered in roughly 5-6 months time after hair transplant.