19 months post hair transplant, was it a failure?

Hello, and thank you for your question. Full growth is judged at 10-12 months. Sometimes the native hairs in the recipient area will continue to thin over time which can give the illusion of a failed transplant, when in reality most of the density is actually from the transplanted hair. 
It is clear there is definitely an improvement from pre-op to 19 months post-op, but I see where the issue is. A further in person consultation would be needed to determine whether the transplant was not entirely successful; it is nearly impossible to tell simply from photos. 

Gary Linkov, MD
Hair Specialist
Manhattan

More pictures are needed to help evaluate your progress. Specifically, photos of your hairline before the procedure and after the procedure are needed.

Hello and thank you for your question. It is really difficult to tell by only looking at your pictures. Many factors can play a part in what make you think that your procedure failed, such as thinning out of native hair that was there before the procedure. I suggest you to have a second opinion and be evaluated live!
Good luck.
Hope this helps.