Kayn loginscreen wallpaper

Would it be possible To make a wallpaper for the current loginscreen? You know The one with kayn and Ashe? The pics that exist right now are to small to be used as a wallpaper or as a Background. Everytime i tried i got bad quality and it looked bad. Of Course One for darkhin kayn to The people Who prever darkhin Kayn over assasin kayn

Would that be possible?if yes that would be great since i rly like the art in the asssin kayn loginscreen.if there is Already a wallpaper Version of it pls send me the link.