High-Res Photo Watermark Removal

I have roughly 40 high-resolution photographs that need their existing watermarks removed while preserving every other detail of the image. These are true photographs—not illustrations or screenshots—so the retouching has to be seamless and invisible even at full zoom... (Budget: $30 - $250 USD, Jobs: Affinity Photo, Digital Art, GIMP, Graphic Design, Image Processing, Photo Editing, Photoshop, Photoshop Design)