Answer:
From left to right images:
brightness, contrast, sharpness
, saturation.
Explanation:
The first image (1st from the left) has the brightness manipulated, since the light on the image looks accentuated.
The second image has the contrast decreased, the image colors are a bit less distinguishable.
The third image has the sharpness increased since borders are more accentuated and sharper.
Finally the fourth image has its saturation decreased since all colors are significantly less vibrant.
