My chest was totally flat post op, and a few months later, now that I've been working on building up my muscles, it's not totally flat. Your chest looks like normal-sized pecs without a shirt on. It may be different if you wear a tight shirt. Also, you should note that swelling can take a very long time to go down. It doesn't just vanish a few months later. Sometimes it can take a little over a year to right itself.
Honestly, if you're not happy with your results, you can talk to your surgeon and see if he'd be willing to remove more tissue after some time has passed. You should be able to get a revision if you don't feel like it's what you paid for, you know?