In the realm of digital artistry, behold the magnificent creation: an anthropomorphic blue dog, an embodiment of intricate craftsmanship and breathtaking realism. This portrait encapsulates the essence of creativity and technological prowess, a testament to the capabilities of Unreal Engine, Octane Render, and Redshift Render.

The central figure, our anthropomorphic blue dog, stands as the epitome of both charm and mystique. Its cobalt-blue fur has been meticulously rendered with an abundance of detail, each individual strand glistening in the cinematic lighting. The dog's most captivating feature lies in its big green eyes, a pair of windows to its soul, imbued with a sense of life and depth that enchants all who gaze upon them.

The finely detailed armor adorning our canine protagonist is a marvel in itself. Every inch of the armor is etched with an intricate filigree metal design, reminiscent of an ancient, mystical craftsmanship. Each flourish and curve in the filigree tells a story of artistry and dedication, with the reflections and highlights dancing gracefully in the 8k resolution.

Cinematic lighting plays a pivotal role in this masterpiece, casting dramatic shadows and illuminating the dog's countenance in a way that feels as though it belongs on the silver screen. The interplay of light and shadow adds an extra layer of realism to the character, making it come alive in this digital realm.

As for the technical aspects, the Unreal Engine's power brings the character to life, providing a dynamic and immersive experience. Octane Render and Redshift Render enhance the realism further, creating textures and materials that are almost indistinguishable from reality.

In summary, this portrayal of an anthropomorphic blue dog is a true work of art, where technology meets creativity to produce a captivating and realistic masterpiece. It stands as a testament to the limitless possibilities of digital artistry in our modern age.