His use of colours is commendable. He uses the full palette. No monochrome nonsense in his art. Every colour is touched, always appropriately , never excessively. They way the colours gel together is worthy of much appreciation. They are a delight to the eye of the beholder.
He is a master of colour composition, trying to rejuvenate each cover with a different shade, a different end of the spectrum.
He is like a culinary genius or a musical maestro, each choosing various ingredients of their chosen art to create and compose a mixture that soothes, teases and entices the senses.