A different mood can be conveyed just by changing the crop and color of a picture.
This is the original, unedited image:
…and this is the grainy b&w version – cropped in square format:
I like both pictures. The first one has more context and looks more ‘natural’ but the second one is ‘tighter’ and has a different mood altogether.
With the square and b&w image, I’m focused on whatever my kids are laughing at – so in essence, the subject is external to the picture and the picture itself is just a manifestation of what caused the laughter.