FIRST You need to find someone who has good skills in taking screenshot
why you have to do this? because you are retarded and you can't take good shot so you must steal it from others :(
find someone with talent and save the screenshot you must use browser you can't save screenshots using steam :)
for example this shot
now steal it and save it !
now open the photoshop
add the screenshot
USE CTRL+A so you can grab the whole shot
Select FREE TRANSFORM
Then click on Flip Horizontal
Save The shot and CONGRATS now you have your own shot and the real author can suck your ****
Final Result