Steins;Gate (0) Poster Art

Hello, I'd like to get a Steins;Gate poster for my room but the issue is that I just couldn't any high-quality - high-quality referring to pretty much anything that can be tagged as absurdres - renders of some of the official artwork (see the MAL pictures section for S;G & 0).

I've found high-quality renders of some of huke's artwork on Danbooru and the like and I've found a high-res render of the movie artwork but that's about it. Could anyone perhaps help me out? It would be greatly appreciated