Hair still thin after 8 months post op HT, what should I do? (photos)

At 8 months you should have the majority of your growth.  Looking at your photos, the scalp tattoos seem less visible in the postop vs. preop photos so there may have been some growth.At this point, it's time to visit your surgeon, review the standardized preoperative photos and discuss your concerns.  You should also consider and discuss (if you haven't already) non-surgical adjunctive therapy such as minoxidil (Rogaine), finasteride (Propecia), platelet-rich plasma (PRP) and laser therapy to maintain your hair and prevent further loss.

It generally takes about 12 to 15 months to get the final results after hair transplant.  The transplanted hair will initially become dormant and then regrow in a miniaturized state prior to the final (normal thickness) growth stage.    It is very common to feel frustrated at this time (8 months out).  You may want to consider Platelet Rich Plasma Injection therapy (with or without ACell) to stimulated further growth/improve miniaturization or allow about 4 to 6 more months for the hair to thicken up.  Laser light therapy with red laser light may be beneficial as well.