This photo expresses a lot of emotion captured by the setting of the ER, and by the depth of field.  It was changed to black and white as to give the photo a more dramatic edge, 

This photo was fixed using more saturation, color, and adding in the cactus and the light shining from above.  This created a cartoon effect as well. 

This photo has a great usage of depth of field, and lighting.  You can see the depth of field because everything that is close to the eye is in focus and everything in the background is blurry.   (This also shows you my exact point of view, how I was seeing the hospital that day. )* You almost feel as if you are the one holding the camera.   The leading lines make it pleasing to the eye, and the contrast of colors are what make it pop.