This style is based on Yiu, a french action grim dark apocalyptic comic with heavy religious themes. It's good at:

• Over the top gothic architecture

• Red skies

• Religious themes

• Super nice explosions

• A cool short haired redhead with radical shades

I can either use this set of tags for a more digital painting look:

nemo_assassaints, science fiction, 

Or this set for a more hand drawn look:

nemo_assassaints, science fiction, traditional media,