Good evening. It is difficult to answer your question with limited views of your photos and without direct examination. Although you may have some residual swelling at 8 weeks post-op, your fullness may be due to extra-abdominal and/or intra-abdominal fat. Please continue following up with your plastic surgeon. If you are unhappy with your outcome in couple months, you may need liposuction vs. weight loss. It would be best to discuss your options with your plastic surgeon.
Don't get too anxious...normal to have swelling after tummy tuck. I tell my patients that 50% is gone around 6 weeks, but it takes about 6 months for all the swelling to resolve. The best option you have is to wear compression which will help control the swelling. If you feel any fluid or feel that the swelling is worsening, I would go see your surgeon and make sure you do not have a seroma.