Grenville's current, internationally-popular work specialises in dramatic animal portraits, often large scale and close up. Detail and accuracy are key. He is passionate about telling the story of each creature, accentuating the wildness, dignity and soul of each animal. The rich narrative of the painting is often further enhanced by its elaborate or traditional framing, matching perfectly with the inventive, decorative backdrops that often make reference to rich tapestry motifs, Arcadian glades and medieval style foliage.