Prompt: a painting of a cherub, digital painting and concept art, by Stephan Martiniere, macabre and grotesque, alien organism of tendrils and blades, in the style of Zdzisław Beksiński and H. R. Giger, mecha armor and weaponry, biomechanical wings tattered and serrated, haunting shadowed lighting by Shinichiro Watanabe and Masashi Kudo, macabre detailed portrait, gruesome combat damage and decay