Sagging cobra neck lift. What would you do to correct this? (Photo)

Thank you for posting your question here!My answer will be based on the limited information and pictures provided, for medical advice please consult with your plastic surgeon.
I am sorry that you did not get the result you were looking for. You do appear to have cobra neck deformity which usually happens when excessive deep fat is removed , the platysmal edges are not brought together or the sutures holding them together break or cut through the muscle. that being said this deformity can be corrected usually by bringing the edges together through the same incision , potentially removing more skin or fat grafting.
In the mean time massage the area gently once cleared by your surgeon and give it some time to soften so it is easier to perform the revision.
I hope this helps, best of luck !

A revision to resuture the platysma borders in the midline and then laterally with additional skin excision around the ears would be recommended. In the meantime, continue massage of the area to ensure the tissue is soft and supple prior to the revision.

At one year, you can consider undergoing a lower face and neck lift procedure to address your issues of platysma muscle bands, lateral fullness in the neck, and loose skin in the neck itself, lift the jowls and address your Cobra neck deformity. Choose your second surgeon wisely based on extensive experience producing natural results.