I'm now 7 months post op. Really disappointed with the density of the transplant. I had 1500 grafts (Photo)

You still have another 5 months or so for full density and results to be apparent.At that time I would recommend a follow-up evaluation by your surgeon.You may want to do another procedure to add more sequential density.

You have to understand everything you see or read on the Internet is not always true and it may not apply to your particular case.Surgery does not give you exact results as different doctors or clinics may be better than the other.Finally, you should have had a firm understanding of realistic expectations (what to expect) explained to you by your doctor.

1500 follicles is not enough for a female hairline lowering procedure. I always inform my patients that they will need another procedure to fully maximize density. You will need another procedure for sure. 

It's a hard thing to gauge without seeing any before pics, but in general at 7 months it's definitely possible you'll see a little more improvement. Generally patients shouldn't worry about their progress (barring zero growth or incredibly patchy growth) until close to 9 or 10 months. While I doubt you'll see a huge improvement, you may see some differences by then. 
If you're still unhappy definitely talk to your doctor- there are some other options that may help improve density or even a second transplant could be a potential solution for you.

It looks like the transplants grew but if you have fine hair, a second hair transplant could have been predicted but based upon these photos, it will be needed anyway. More length will help.  I always tell my patients that a second transplant may be needed if there is not enough fullness present, something almost always the case in people with fine hair.