Mood is the feeling a picture invokes. A photographer can portray their mood or a mood they want the viewer to feel by photographing different elements. Specific elements evoke different feelings. For example an image of the sun and a blue sky can convey warmth and happiness. Fog might convey anxiety or mystery. One person may feel something different when seeing a picture then another depending on who they are.
Losevsky Pavel

Article on Mood
By Payal and Katie