Look at the two images accompanying this posting? They were both taken in Cambridge in the recent big freeze at slightly different times on the same day. However, what sort of different atmosphere or mood does each evoke? For me one is warm and golden, while the other definitely has a touch of the Jackson Pollock's! (This is an Australian slang reference to the painting Blue Poles by the artist Jackson Pollock, purchased by the Australian National Gallery at great expense and causing much controversy a few years ago. I think you can see the connection.)
What does each image say to you?
So if, as Martin Gray in The Dictionary of Literary Terms, says: “Mood is a term used synonymously with atmosphere to indicate in a literary work the prevailing feeling or frame of mind, especially at the start of a play, poem, or novel, creating a sense of expectation about what is to follow.”, as writers, how do we achieve the same mood in prose as these images convey?