Create a serene, evocative pastel drawing of a tranquil desert oasis at sunset. A cluster of towering palm trees frames a shimmering pool of water, reflecting the warm hues of the fading sky. Desert flora, such as cacti and succulents, line the edges of the oasis. A distant rock formation glows red and orange in the last light of day, while a few soaring birds create elegant silhouettes against the vast expanse of the desert. The pastel medium captures the soft, blending colors of the sunset and the subtle textures of sand and rock, conveying peaceful solitude and stark beauty.