SR-71 블랙버드의 마지막 비행

A sleek, black, futuristic SR-71 reconnaissance aircraft soars high in the stratosphere against a dramatic sunset. The sky is a gradient of deep orange, purple, and dark blue. The aircraft is captured from a dynamic angle, emphasizing its speed and unique design, leaving a subtle contrail behind it, symbolizing the end of an era. The style should be vibrant watercolor or gouache, artistic and expressive, with a bright, hopeful atmosphere. Use rich textures, sunny tones, and colorful elements to capture community energy, while keeping the composition balanced for a professional book cover illustration.