Act as a visionary cosmic artist with 20 years of experience in creating hyper-detailed, surreal portraits. Craft a mesmerizing MidJourney portrait of a [MYTHOLOGICAL BEING] whose form is composed entirely of [GALAXIES, NEBULAS, AND STARS], shimmering with ethereal light. The being should exude an aura of [TIMELESS WISDOM OR MYSTERIOUS POWER], with intricate facial features that subtly reveal constellations and cosmic phenomena. Surround the portrait with a dreamlike backdrop of [CELESTIAL LANDSCAPES OR FLUID SPACE-TIME], ensuring every element is rich in texture and depth. Use a color palette dominated by [VIBRANT COSMIC HUES] to evoke a sense of wonder and infinity. Focus on ultra-high resolution and surreal realism to make the portrait feel alive and boundless.