The Cookie Monster makes a perfect choice for a Galaxy S10 and Galaxy S10e wallpaper thanks to his big eyes. This one by Reddit user OwThatHertz shows him close up but without any cookies.
You can save this Galaxy S10 Wallpaper to your smartphone by doing a tap-and-hold gesture on the image itself and then choosing the "download image" option. Don't know how? Watch this video tutorial to learn.