After 4 months, my transplanted hair is still falling out. Is that normal? (photo)

It is always a good idea to follow up with your doctor. You don't have to be upset.  If you believe something is not right, just call your doctor.  Transplanted hairs fall out weeks after surgery.  It starts to grow several months after surgery (6-12).

Its unclear what you mean by transplanted hair is falling out.  Its normal for the shaft to fall out after the follicle is transplanted.  The size hairs you show are too long to be transplanted hair only 4 months after transplant.  Most transplanted hair doesn't start to grow until 6 months after surgery.  Good luck

You should go in and get examined by your doctor to make sure nothing else is going on. Also, it is important to note that no transplant is 100% and having a transplant does not guarnatee it will work.  All doctors tell yuo this and its in all the consents.  Like any medical procedure, every person does not respond the same.  For the final results, its best to wait 2 years before making any judgments since it can take that long for the final results.

I wonder if what you are talking about is your native hair not the transplanted hair. Look at the length of the hair and it looks native to me. That means what you are seeing is shock loss induced by the transplant. See the video below which explains this

It is normal to lose between 80 to 100 strands of hair per day.  To slow down the hair loss you can start on a medical regiment routine such as rogaine and propecia.