slim post-apocalyptic Robot concept art, inner mechanics showing, hunched over, tribal paint decal, tribal pirate aesthetic, torn fabric, welded scrap metal, brown and black tones, black tones, dark tones, lab background, rim lighting, deep shadows, ((graphic novel sketch, black sketch lines, low-key cinematic lighting, thick ink outlines, digital oil painting, posterized, cel shading, vector illustration, tenebrism, bold brush strokes, subtle colors, subtle lighting))