Prompt: looking up in the sky,portals in the clouds, lot of small alien ships come out, start shooting lasers at each other, orange,red,purple sky, professional ominous concept art, by artgerm and greg rutkowski, an intricate, elegant, highly detailed digital painting, concept art, smooth, sharp focus, illustration, in the style of simon stalenhag, wayne barlowe, and igor kieryluk.
Negative prompt: big alien ships