I am a very visual individual and look everywhere for inspiration; a movie, music, art. All of these can be very helpful when getting the creative juices flowing, especially music and art.
I will set up playlists, typically two, for any given project; the soundtrack and the score. Certain lyrics and melodies can stir up scenes and emotions that help me to give that little bit of essence.
I also set up Pinterest boards with sections for everything from character development, clothing styles, right down to cityscapes. They say a picture is worth a thousand words, well then one hundred pictures can be an entire novel.
People watching can also be a lot of fun. You can learn a lot about how someone moves, the nuances to their speech, their body language. It has definitely become a great way to pass the time while commuting on the train, or just sitting at a local coffee shop when you get stuck on an idea.