This build has a healthy balance of quality detailing and effective techniques. The pentagram and demonic skull are cleverly designed, but the majority of the build features simpler architecture that gives it hearty substance without overwhelming the viewer.
What struck me most immediately about this build is the excellent presentation! Real lighting effects and the inclusion of smoke (perhaps real, perhaps added in post-production) energize the build, giving it a mysterious and malevolent atmosphere. A single nanofig stands at the threshold of unknowable evil, illustrating the feeling of enthrallment this build creates. In the foreground, tangled brambles add visual variety and another color to the build without forsaking the pervasive feeling of DOOM.
Anthony has suggested a fitting soundtrack to accompany this masterpiece. Click on the image above to visit the original photo and find out what it is!