For a sharp print, an image should ideally be 300 DPI. A 2560x1440 image is roughly 8.5 x 4.8 inches at high quality. If you want a larger poster, you might need a 4K resolution image instead.
This platform offers a filtered Harry Potter collection specifically for QHD/16:9 displays. 2560x1440 Hogwarts Castle Wallpaper HD">
Known for verified high-resolution images, you can find various Hogwarts night scenes and concept art specifically scaled to 2560x1440. For a sharp print, an image should ideally be 300 DPI
If you were looking for a specific (like parchment or hand-drawn paper), you can find aesthetic Hogwarts illustrations on Pinterest that mimic the look of the Marauder's Map or vintage sketches. Harry Potter Castle Wallpaper - Pinterest For a sharp print
If your mention of "proper paper" refers to the wallpaper: