Take a look at this wonderfully simple and exquisitely beautiful oil painting. AP graders eat this kind of work up. Why? It looks real. The artist using repetition with the repeating lines with variety with the one pillow that has a floral pattern. It is unified with an analogous cool color scheme. It's all the design principles perfectly placed. I want this piece to inspire you. Painting something as simple and yet complex as this painting. Don't copy, just learn from it and bring something of yourself to the table! Have a great summer.