E - Wallpaper ( part 1 )

File > New 

Preset : Internasional Paper , Size : A4 > press OK

Image > Rotate canvas > 90 degrees

go to File > Open 

Select the pictures

pictures will place in workspace

drag the cloud image to the work space that you just open 

Click "Ctrl + T" on the keyboard for scale the picture as a background

Drag the mountain image to the workspace

by using the same method press "Ctrl + T" Scale the picture as u want 

Using Magnetic lasso tool > select the area that you want to erase > press Delete on the keyboard to remove

press '"Ctrl + D" on the keyboard for remove the selected area