I underwent a tummy tuck 7.5 months ago, my results are underwhelming. Do I need a revision, just more lipo, or what? (Photos)

You need an examination to be sure, but based on your photos, you appear to have visceral fat which cannot be addressed except with weight loss. Please discuss this with your surgeon.

I'm sorry you are unhappy with your tummy tuck results. You may want to consider liposuction for further contouring. The belly button scar is a bit hypertrophic. You may benefit from steroid injections or scar revision. I encourage you to discuss your concerns with your surgeon. If not satisfied after that conversation, seek a second opinion from another board certified plastic surgeon near you.

Based on your photos your abdomen still looks protruding, you have dog ears and in my opinion your buttocks are saggy showing wrinkles in the bottom of the butt.
I would re-do completely the TT and convert it into a circumferential Tummy tuck in order to do a nice tight Muscle repair to achieve a flat abdomen and tapered waist, dog ear resection and real buttocks lift. I would complete the beautiful transformation doing liposuction to your waist and lower back and transfer a mild volume to your buttocks and preserve the athletic look.
Be encouraged! You will look fantastic!
Dr. Cárdenas