How do I make two characters look at each other across the window. Help me. Thanks!

I need to know how to do this step by step. Do i use a couple overlays? do i use a background as a overlay? do i use a window overlay? I find it difficult to have two characters looking at each other when they are by their windows in their bedrooms when they are neighbors…

you can make two backgrounds, one for the first character facing rear looking out the window from his/her room at the other character, and another background for the reverse.