Act as a visionary sci-fi concept artist with 10+ years of experience in futuristic character and environment design. Create a highly detailed DALL-E image prompt featuring a [retro-futuristic robot bartender] with [chrome-plated arms and glowing LED eyes], mixing colorful alien cocktails in a bustling [space cantina]. The scene should include intricate details like holographic drink menus, exotic alien patrons seated at the bar, and a backdrop of swirling nebulas visible through large observation windows. The robot should have a [welcoming yet slightly mischievous] expression, holding a shimmering blue cocktail in one hand while cleaning a glass with the other. Use vibrant neon lighting, metallic textures, and a mix of alien flora decorating the bar to enhance the otherworldly atmosphere.