Check Out Infinite Possibilities! They accept requests for posters, graphics, character charts, one shots, backgrounds and banners. I've checked out some of their designers' works and they're really cool. If you want to request, please visit their shop :)

https://www.asianfanfics.com/story/view/189418/infinite-possibilities-a-graphics-one-shot-request-shop-ip5th-graphic-graphics-oneshot-poster-request-postershop-graphicshop