Clever. Negative Space Art by Tang Yau Hoong | Bored Panda
The use of a warm and cool color and in addition, the range of saturation and different tones so as to avoid being too vibrant. Also note how the darker blue would be aligned with the lighter red, and so forth to avoid giving off a negative effect and more of a soothing one
I really like the pop of black text at the bottom in contrast the white and pastel colours surrounding it.