I had an FUE hair transplant 9 months ago. 2600 grafts. Hairline is not dense. Should I expect more growth or what? (Photo)

A 9 months, the hairline should have filled in. You have experienced poor growth. i cannot tell from your photo, but it seems you have curly hair? If you do, then a possibility is that your grafts experienced trauma or breakage during extraction. Most conventional FUE tools are not capable of extracting viable grafts in patients with curly hair who als0 have thick scalp skin characteristics. I invented the DrUPunch Curl which is  successful even in the most tightly wound hair found in Afro-textured hair. You would need 1500 grafts to restore your hairline from this current state

It can take 6 to 12 months after surgery to see results.  If you are concerned it is best to contact your doctor.

It takes up to a year to see full results but based on your photos you will probably want to do another procedure to add more density to the hairline.I recommend following up with your surgeon to discuss this issue.