me too, she is drawn by "umiu" who probably will upload a higher resolution image via twitter at ... https://twitter.com/umiu ... very soon, and who also has drawn four other little beauties for cipher so far (o^.^o)
edit: sorry, the regular SR version of micaiah is drawn by "nij_24" who has a very similar art style (for me ;oD), and the corresponding images were uploaded at ... https://twitter.com/nij_24/status/976477313587068928 ... a few minutes ago :oD