Preview of the Final Result
Step 1Create a new 1500x2100 px document in Photoshop and fill it with white. Open the sky image and drag it into the white canvas using the Move Tool (V). Place it in the upper half.
Step 2Go to Layer > New Adjustment Layer > Curves and decrease the lightness to darken the sky to fit the nighttime.
Step 3Create a Color Balance adjustment layer and change the Midtones settings to give it some blue.
Cut out the temple and place it in the top right corner of the canvas.
Step 5Go to Filter > Blur > Gaussian Blur and change the radius to 8 px. This step is to separate the temple on the background from the main subjects in the foreground and help to increase the depth of the scene.
Step 6Make a Color Balance adjustment layer above the temple one and set as Clipping Mask. Alter the Midtones values to make the temple's color fit the background.
Isolate the model using your own method and place her in the middle of the foreground (feel free to use your own image).