Mark Brown:
https://www.pinterest.com/pin/272819689897170462/

1. This image is a silhouette.

2. I think the photographer metered near the light in the photo. By metering on the light, it brings out the contrast in the photo, and darkens the dark subjects.

3. I think the Photographer was going for a very creepy or mysterious mood.

4. If Mark Brown metered on the darkness of the photo, then the photo would become very bright. You would be able to see the details of the subject in the photo, and the background would become very bright.

Wendy Laurel

https://www.pinterest.com/pin/234327986831596516/

     1.  This image is a backlit photo.

   

  2.  I think the photographer metered on the feet of the people or the chair/couch legs. If they had metered on the light in the background, the subjects of the photo would have become silhouettes.

    

 3. I think Wendy L. was going for an at home, warm feeling/mood. 

   

  4. If they had metered on the light in the background, the subjects of the photo would have become silhouette. Personally I don't think that by changing it to a silhouette would change the mood very much. The only difference would be that you wouldn't be able to tell what is going on in the photo.