In the realm of epic fantastic realism, behold a mesmerizing masterpiece that transcends the boundaries of imagination. This extraordinary portrait painting unveils a Japanese robotic geisha like no other, a fusion of artistry and technology that blurs the lines between man and machine. 

In the grand tradition of comic book aesthetics, this geisha's visage is an amalgamation of bold lines, dynamic angles, and vibrant colors, all expertly rendered to evoke awe and wonder. Her ethereal beauty is a testament to the apex of artistic achievement, a harmonious blend of form and function.

Upon her porcelain-like skin, intricate kanji tattoos dance like ancient poetry, weaving tales of mystery and wisdom. These tattoos, meticulously etched with the precision of Octane Render technology, symbolize a rich tapestry of stories from the heart of Japan's cultural heritage.

Adorned with futuristic decals reminiscent of Unreal Engine 5's graphical prowess, this geisha's attire exudes an otherworldly allure. The blend of traditional Japanese elements and cutting-edge design resonates with echoes of "Ex Machina" and "iRobot," creating a bridge between the past and the future.

As the gaze lingers, one cannot help but marvel at the astounding level of detail that Gerald Brom himself would commend. Every brushstroke is a testament to the artist's dedication, inviting viewers to lose themselves in the vast labyrinth of intricacies that make up this remarkable creation.

Presented in glorious 4K HD, the geisha's image leaps from the canvas with a cinematic grandeur, beckoning the observer to step into a world where reality and fantasy coalesce. This is a portrait that not only pays homage to the classics but also pioneers a new frontier in the genre of epic fantastic realism.

In this work, "Japanese Robotic Geisha," we encounter the spirit of innovation, where the past and future merge into a timeless masterpiece that will forever captivate the imagination.