Editing Image URGENT


hey, I just got someone that asked me a favor, and is paying me with big money, so I dont want to turn the job down. So here is what they want…

She wants a normal womans body, and to the left the same person, with same clothes but thinner… like 1.bones 2.really thin 3.thin 4. normal
and then to the right fatter. 4.normal 5.chubby 6.fat 7.really fat

So… is it so hard to do? I was thinking doing it on Photoshop. Any help?
I would really appreciate it… so much… any ideas on what I can do??
I was thinking with the effect “liquefy” but it isnt as realistic… You’ve seen the celeb pictures of them fat? that look very realistic I want something like that…
Thank you… SO much.