Hey, answering the requests to show how the evermoton did their passes combination…
Of course I use much more advanced method for adding passes in photoshop, soon I’ll be realising some video training on that matter…
In a mean time check out that video tutorial, it might give you some basic ideas regarding photoshop blending modes, masks with passes usage…

Here is the Evermoton link for downloading their PSD free sample


Hope you find this useful, if something was unclear just post a comment…

Talk soon,

Alex