First I removed the wooden thing... (cant remember what its called.) And used the clone tool to patch up tree and wall.
step 2 of 4
Decided to remove wall and add sky with gradient. Stars made by adding noise then making changes till they look right. Made lights with colored brushes.
step 3 of 4
Added garland with brush found in with photoshop's defaults, and changed brush options.
step 4 of 4
Added moon with distort and blending changes till looked right. Added glow by duplicating layer and blurring. Added finishing touches.