Contast- Does the image have a full range of values? This is also called full tonal range - highlights, mid tones, and dark values or shadows. An image is referred to as flat if it is lacking contast and punchy if it has too much contrast.
Brightness/Contrast
Levels- if image needs overall contrast
Curves- if image needs contrast within the midtones
Color- Does the color in the image look natural? Adjust the color using color balance. For example, if the image looks too blue, move the arrow on the scale towards yellow (its compliment) to make it the color more even and natural.
Color Balance
