Our good friends over at www.Pidgi.net have managed to obtain 1080p versions a while ago of the SM11 Unified Minds artwork. These come from Pokemon TCG Online and look super awesome. You can see Mitsuhiro Arita his work in full detail! These come with Umbreon & Darkrai, Espeon Deoxys, Giratina & Garchomp and Mew & Mewtwo.
If you want to download them uncompressed in 1920x1080 resolution, please visit their website, i have linked the pages down below. And please give them love over at twitter @PidgiWiki !