Double exposure is having two pictures shown at once in one composition. Sepia is turing everything a brownish colour. Emphasis is leaving everything black and white except one small part. Black and white is draining the pigment out of a picture. Boat in hand is exaggerating the size in a picture so that one is really small and one is really large. Silhouette is having the foreground black and colour behind it. The rule of thirds is that having the main focus off to the side and having the same amount of negative space on the other size makes the reader more visually intrigued.