- Open all images. Duplicate the Layer by right click on it.

2. Match the color by going to Image>Adjustment>Match Color. Select the source and adjust Fade, Luminance, Color Intensity.

3. Move the sunset image into original image.

4. Add a Vector Mask.

5. Select Gradient Tool and gradient sunset color from bottom to top. You may try more than once.

6. Result.

Please review the step by step 5 minute video: