There seem to be a set of posters for the promotion of 3gatsu no Lion volume 6 and Spica featuring illustrations by Umino Chika. They can be found on the official 3gatsu website,
http://3lion.younganimal.com but I've saved them for this post.
BTW, anyone seen a volume 6 raw? And shoutout again for anyone interested in translating Spica.
Click for bigger version.