I read that a lot of models etc get eyelid surgery to give them a more defined crease, I'm not sure if Tsubasa has done this but it wouldn't surprise me. Also looking at older pictures of her, her nose seems to have gotten smaller so I think she might have got a nose job as well..Alot of things can change over time anyway, you'd be surprised at the power of, camera angling/make up/photoshop and a pair of circle lenses! I did find this though: http://kyaapink.tumblr.com/post/2346706622/before-and-after-tsubasa-masuwaka
Not sure if it's real but it shows how different she looks from then to now!