Open an image editor or photo app
Load the base photo
Add the second photo as a new layer
Resize the second photo
Move it to the desired position
Adjust opacity if needed
Crop or mask the edges if needed
Save the final image
Open an image editor or photo app
Load the base photo
Add the second photo as a new layer
Resize the second photo
Move it to the desired position
Adjust opacity if needed
Crop or mask the edges if needed
Save the final image