This bird is chirping joyfully with its eyes closed, and its beak open wide. Its head is tilted back and its wings outstretched, letting the sunlight cast a beautiful yellow glow along its feathers. To bring out the details of the image, I would use light orange and red tones to create a more nuanced look to the color palette. Then I would use deeper oranges and browns to add warmth and texture, while cool blues and greens can be used to emphasize the bird's wings and the leaves of the tree. I would then finish the illustration by adding a few touches of white to create a shimmer effect in the sunlight. The final result would be a stunningly vibrant and detailed piece of art.