Based on these photographs you appear to be an excellent candidate for a full tummy tuck with muscle reconstruction. This will flatten the muscles, reconstruct your core muscular corset, revise the belly button, eliminate the stretch marks from the belly button to the pubic hairline, and remove the loose skin and fat of the anterior abdomen.
Just based on your history of weight loss and your photo, you would be an excellent candidate for the tummy tuck. I would suggest meeting with a board certified plastic surgeon and discussing all your options. Congratulations on your weight loss!