Transparency Issue

[Giankharlo]

Hello to everyone here , I'm pretty new using keyshot 5.1 pro , trying to simulate a transparent plastic material for some action figures , problem is that I can't get a realistic effect as you can see in the image I'm attaching there aere some areas where I should be able to see through but I'm not getting that effect , I check the this tuto but even if im following all the stepslike that I'm not able to achieve the transparency effect I desire .

https://www.youtube.com/watch?v=heyF-wVVAdo

Can anyone please drop me a line and let me know what do I have to adjust

https://www.dropbox.com/s/vl2mwrnvuevo593/transparency.jpg?dl=0