A haunted house with the moonlight glimmering over the structure in the night time is one of the classic images we see around Halloween time. In this vector, the artist was able to portray his idea of the haunted house in a unique way. One thing that really helps our attention to go straight to the haunted house is the contrast between the house and the moon. It is the first thing we look at, and our eyes almost don’t want to leave the house.
Each object has some kind of pointed edge. He could have rounded the edges to make it softer and give us a different feel. But the pointed edges are almost jarring in a good way. It also helps with the detail in the house.
Yellow and blue are opposites in the light color wheel. Depending on what kind of effect you want to an image, you can add blue to make it more gloomy and cold or yellow to make it warm and happy. The artist used both colors here most likely to provide contrast and tell a story with his bright moon and gloomy night.