: A great source for specific character renders, especially close-ups of Satoru Gojo and Yuji Itadori that can be cropped or downloaded in custom resolutions. Popular Characters & Styles
If you are looking for that exact 1920x1526 resolution, these galleries are your best bet:
Finding the perfect 1920x1526 resolution wallpaper for Jujutsu Kaisen can be a bit of a challenge since it's a specific "Box" or aspect ratio resolution, but there are several high-quality collections that offer this size alongside standard HD and 4K options. High-Quality Wallpaper Collections
: Offers nearly 50 high-resolution backgrounds, including dynamic group shots and character-specific art of Gojo and Sukuna.
: This site specifically lists a 1920x1526 option titled "theath" among its 40+ curated images.