Is my wound healing after necrosis? (Photo)

The open ones demonstrated in the picture should heal spontaneously with proper wound care. It's highly likely however that a scar revision will be necessary.

This necrotic problem will heal.  Revisions will be needed after a year. Don't rush.  There are many ways to correct nipple loss  

It appears that your areola was deprived of enough blood supply that some of it was lost and debrided by your surgeon.  Closing the wounds after such debridement usually fails and extends the healing time, so that is rarely done. Therefore you are seeing the subcutaneous ("under the skin") fat, and this will heal as the edges are drawn together by the healing process. It may be that the long term scars will be less than desirable, and that would be a fairly easy revision for your surgeon to accomplish.Follow with your surgeon, all the best.