Effective weight loss and getting six pack abs?

I have been on a regiment for 3 months now and have lost 35 pounds. I do weight lifting 3 times a week and do ab exercises. My stomach is still flabby and I have a ways to go. I drink pretty much only water, with the occasional diet soda once or twice a month. I dont eat a lot of sugars but i do eat some and i eat healthy and keep under 1500 calories. Is this good after 3 months? Does anyone have any suggestions on how to get tighter abs? Anything I can do to make the weight loss go faster? Or am I at the right pace? Any help would be great and thank you in advance.