Step one:
Selecting a Background Image and editing it to be into the required size.
Tools Used:Clone stamp tool: Duplicating the background sky and the building onto the right. Polygon lasso tool was used for selection.
Step two:
Importing source images,
Tools Used:Magic wand was used where there is singular color in the source images. Later as the layer is imported, blending options were used, outer glow, color overlay.
Where there is a specific selection in the source image, Polygon lasso tool was used the most.
Where there is a specific selection in the source image, Polygon lasso tool was used the most.
Step Three:
adding the light effect, adding light on one of the source images(people (right-bottom) in the composition 
Tools Used:
Dodge, Burn tools were the most used to tools using Highlights and with exposure 50.
The light effect
A new layer was added using the layer window.
Paint-bucket was used to drop slightly grayish white. The source(bottom) was highlighted a little, using dodge tool.
The opacity was reduced to 40% in the layer window.
Finalization: 
The Layer with the people in it was copied (Alt+Lmouse) color overlay to black and later the opacity was reduced to 50%. A copy of that layer was made and motion blur was added in the direction of light. [ filter>blur>motion blur…]
The sizes of the text and Images had their final alteration to fit into the composition.
The Final out Put of the post card is in the next page
FINAL OUTPUT:
