I took an image of an Urban alleyway and just went with the flow really, firstly I changed the sky using colour range to select the white areas of the image and then used the dapper to add into the white to select the whole sky, I then found an image of the sky I wanted and dragged it in using free transform to position it where I wanted. Then on the original layer on the colour range I selected the white and went back onto the new sky layer, I then created a layer mask to add the sky in. Next I used Curves to get the required lightness/darkness on the sky.
I then added some lighting into the image, so I drew beams of light using the pen tool to draw the shape and then filled them with solid white, I then used a Gaussian Blur and lowered the opacity to create a sort of glow emanating from the sky, down the alleyway.
Next I wanted to add something to the plain brick wall, so I took an image of the Joker and used filters to make it appear more illustrated, and then I used the layer blend modes and changed the perspective with transform to make it appear to be on the wall.
Lastly I wanted to add a person, so I searched high and low to find a decent profile image of a hooded person, and when I came across one that would work it was cut off just below the waist. Undeterred I used the image and used the pen tool and brush tool to draw in the legs and feet, I then scaled and positioned the person in the alleyway and darkened him up as the light source is behind him. Lastly to add more of a real effect I added a shadow of him in by duplicating the layer and filling it completely black, I then used free transform and perspective to position the shadow before lastly using a Gaussian Blur to make it appear as a shadow.
Before.
After.
