How many grafts do I need to cover a bald area in the photo? (photos)

You may need more than 6000 grafts to get satisfactory density in whole area.But around 2000 grafts can give you a nice font line design which can improve your appearance completely. 

You require 7500-9000 grafts to cover the scalp with medium density. You do not have this number of grafts in your donor area so you will need to make a decision together with your surgeon whether transplanting the front half of your scalp ( and leaving the back untransplanted) will give you the look you want.  Depending on your age and the quality of hairs in your "donor" area you may or may not be a good candidate for surgery. Your discussions with your surgeon need to also take into account that further hair loss will occur in the future - this needs to be factored into the overall plan.