step1 to step 4

step 1 - create a new layer
~go to File,select New then select the preset as international paper
~Choose the size as A4

step 2 - select background photo
~go to File,select Open to choose the preffered image

step 3 - Edit image size
~go to Image,select Image Size

~this is the image size after being edited

step 4 - Duplicate a new layer
~go to Layer,select New then choose Layer and Copy