Create a 4K, Ultra- realistic, high- definition digital artwork portraying an Adeptus Astartes (Space Marine) holding a chainsaw, with venom fangs and a black and blue color scheme. The image should have a mix of micro and lifelike details, but with a slightly blurred effect to convey intensity. Incorporate the styles of Diego Koi and Arkane Lyon, and make it suitable for a movie poster or concept art. Use a fisheye perspective and emphasize the face details, similar to the works of Greg Rutkowski and Brian Sum