Tumescent Lipo upper and lower abdominal area, 500cc of fat removed ...is that enough? (Photo)

It is very difficult to say precisely whether this volume is adequate.  However, for comparison purposes it is very low.  However, a reputable plastic surgeon in a city with excellent medical care, you most likely had the right amount of fat removed.  You should evaluate the results of the surgery at 6 months by looking at the outcome, not by judging the numbers.

I can't tell if you are displeased with your results, or not. 500 mL as a volume speaks nothing to the results. If you indeed still feel somewhat full in the abdomen, you may well be looking at a lot of swelling. You can get a fairly good impression at about six weeks of what your final result will be. It takes up to six months for the swelling to fully resolve.

While 500 cc may not seem like a lot, in a slender person such as yourself it can make all the difference.  Post liposuction you will have swelling which takes between 12-14 weeks to resolve.  Be patient.