Depicting an elaborate fusion of styles and themes, the illustration captures a massive flying saucer looming dominantly over an alien metropolis, rendering an awe-inspiring tableau that resonates with the Art Nouveau influence of Alphonse Mucha, alongside the bold, surreal touches reminiscent of Thomas Ascott, Naoto Hattori, and David Aja. The cityscape thrives with activity below the central spacecraft, which is intricately detailed and hyper-realistic, surrounded by smaller UFOs and floating buildings that echo the playful tones and vintage hues of a colorful fantasy. This creative amalgamation not only features a stark white background that enhances the vivid contrasts and detailed shading of the scene but also incorporates bright, lively colors and soft lighting that highlight the dreamy and light aesthetic of the composition. Such intricacy in the visuals not only stimulates the imagination but serves as a fantastic primer on how to master AI art style guides through the blend of cartoon elements with high detail and realism, ideal for anyone keen on exploring new artistic territories.