Nakayoshi February 2017 issue (release date: december 29th) in which is published the 8th chapter of the new Clear Cards arc of CCS, included as an appendix something that many of you must know about since it's been very popular lately: colouring for adults. Well, not sure about the 'adults' part since this is a manga drawing gifted in a teenager magazine hahaha~
They also included 7 pens.
The illustration is actually the full version of the cover of the January 2017 issue of Nakayoshi:
It's really nice to see the full version of the artwork, even in black and white, since the Nakayoshi's covers are always full of texts and pics, so appreciating CLAMP's artworks underneath it all is complicated to say the least ^^;