Aperture Lab:

 f.22, 1/100, ISO 800

 F.16, 1/125, ISO 800

F. 4.5, 1/800, ISO 800

The focus on the subject is more dramatic. He is clearly picked out from the out of focus background. The softness of the background contrasts the sharpness of his face. In the Other portrait taken at f.16, there is a very busy background with lost of detail and the subject also has a lot of sharpness and detail letting your eye roam over the picture while the second portrait makes the subject more obvious.

 F. 3.5, 1/1600, ISO 800

 F. 8.0, 1/400, ISO 800

 F.22, 1/40, ISO 800

In the first photo with the shallow depth of field, only a small portion of the bike is in focus making it seem as if the logo on the bike is the main subject of the photo. In the third photo, the entire bike, the snow and the street in the background are in focus. It now seems like a street photo and not a specific shot of a bike. There is now a lot of detail over the entire image. We can now see that the bike is beginning the be covered in snow which suggests the bike has been forgotten and left out for a while. In the first image, we don't have much context as to what the bike is doing there. So with a deeper depth of field, we are allowed to understand the entire image and not just a selected portion of it. I feel the second image is the most successful because the amount of blur in the image isn't so much that we lose context to the situation however isn't so little that there is no clear subject being picked out from the background.