One idea;)

HI -- If you have an IKEA near you , they have a great collection of colorful pillows . The colors of your sofa are hard to see on the computer , but you could probably use a pretty green or teal or an orange . Some stripes and solids and or textures . This site will give you some ideas --- Onekingslane.com

another;)

turquoise or pistache pillows, and a glass or mirror center table will lighten up the room, and give it more space, with a colourful picture on the wall !