Create a Reflection

1. Duplicate the background layer ( Command J )  twice so you have 3 layers
2. Using the top layer:
       • invert it vertically
       • reduce its opacity to about 50%
       • slide it down so the boundary of where you want your reflection matches the
         background layer ( in this case, the base of the mosque)
       • go to Filter... Distort.... Wave  ( use whichever settings look good to you)
         ( keep the vertical scale as small as possible   1%)
       • if needed  go to Edit and choose Fade Wave
       • choose a new layer mask and paint out the overlapping area
            ( make sure foreground color is black)
       • change the blending mode to overlay and drop the opacity  if needed
3. Using the second layer
       • use the lasso tool to select the reflection area
       • apply the Wave filter ( Command F)
       • lower the opacity a littlle bit

                                  before                                                                         after

                                                                      

based on episode 36 of Photoshop TV