I wonder what to do with the 2 passport type photos so that they are not lost in the shuffle somehow. I don't think they should be put in loose by themselves. And is there a preferred way of arranging everything else? I recall that there was a preferred way of arranging everything (preferred by USCIS) when I applied for my wife's visa.

I like a clear plastic envelope or bag for the pictures.

I plan on arranging mine like I did the K-1 stuff.

i put mine on a small envelope and paper clipped it to the application. when i had my interview, i saw they took the photos out and stapled it to my application, but i wouldn't do that yet.