This image works really well because you have two equally bold complementary colours and you have filled the frame with them. The blues and greens together like this create a balanced, calm and harmonious feeling so it’s a soothing picture. I’m not sure if you have cropped it, but if you are feeling daring, you could take away a bit from the top (beige background) and left hand side of the image. This could make the image even more striking. 😊