Congrats on losing 31 already!
Is 140 considered "normal" for your height? If so, it might be really hard to lose! Have you thought about adding in weight lifting?
Building muscle has lots of benefits -- including increased metabolism and a "tighter" look! If you look at 2 women of the same weight the one who is more toned may be a size or so smaller than the one who isn't -- a pound of muscle takes up much less 'space' than a pound of fat.