The grafts look great. The results will further improve over the next year to come. If you use minoxidil at this time, you can help the grafts come in quicker and thicker.
Looks good to me. It looks like the hair grew ahead of what the schedule for hair growth usually is. This happens in 5% of patients
Looks fine! At four months it wouldn't be surprising to see no progress yet, so really any significant change so soon is a good thing!
If the photo you attached is the appearance of the transplanted grafts at 4 months, there is some growth there. You need to wait the full 10 to 12 months for the final results.
It can take 6 to 12 months after surgery to see results. If you are concerned it is best to contact your doctor. There isn't much to tell after 4 months.
I appears that your hair changed from brown to black. The hairline created is low and broad. Depending on your age and potential for more hair loss, this could be disastrous in the long run because you will have this low, broad hairline and possibly a lot of baldness behind it. Other than that, it looks fine although the image quality is so poor that it's difficult to say for sure how natural the result is.