Why is my neck and lower face like this after having a concept face lift? (photos)

The concept facelift is a procedure marketed as a particular surgeon's own type of local anaesthetic minimal facelift. Unfortunately for more effective results you need a more complete procedure which involves more extensive work on the SMAS and platysma ideally under general anaesthetic. You have some muscle bands in the neck and combined with a SMAS elevation a platysmaplasty would be recommended 

Hello and thank you for the question. You should discuss your concerns with your board-certified plastic surgeon. There is persistent skin laxity and you benefit from a formal facelift procedure. Best

Thanks for the question.
Concept lift is a minimal facelift technique. It is not designed to address significant signs of ageing unless you are willing to accept minimal results. You would however be an excellent candidate for a Deep Plane extended Face and Neck lift combined with neck liposuction. This will blend both maximal rejuvenation changes in both the neck and the face.
I hope this helps.
Dr. Callum Faris