Can I use previous order's images in my gallery

[naosbi]

I have live gallery turn on.

Wondering what the client agrees on when given permission to use in the gallery. Does anyone know the exact wording?

My idea is to do a collage of my favourite results, which are not always the last ones, in the permanent gallery.  

 

Of course using only the ones previously approved, just wondering to what extension does that permission go.