Here’s a great way to blend multiple photos together to create a photo collage.
Open the photo that you want to use as your base photo—this will serve as the background of your collage. (Note: Make sure you have the Allow Floating Documents in Full Edit Mode checkbox turned on in your General Preferences, found under the Edit menu on a PC or the Photoshop Elements menu on a Mac.) Now, open the first photo that you want to collage with your background photo.
Press V to switch ...