Add a repeating diagonal watermark reading "KOTOVSKIH" across the ENTIRE image, covering all four Halloween ad creatives in the layout. The watermark text "KOTOVSKIH" should appear as a semi-transparent white/light handwritten-style script signature, tiled and repeated diagonally across the whole surface at roughly 30-degree angle, evenly spaced, moderate size, subtle but clearly visible on top of every part of the artwork so the work is protected from copying. Keep the original images, headlines and layout fully intact underneath; only overlay the repeating "KOTOVSKIH" watermark pattern on top.
