So-bin, the artist and original character designer on the Overlord series almost never offers context for his posts on Twitter. (His blog is another story. There, he recently explained that he injured his shoulder and needed to visit a rehab clinic). For reason...maybe because her birthday recently passed.. or the 10th anniversary doings... or because Overlord volume 12 is around the corner, out on September 30th, he shared a Hatsune Miku sketch.
Also, back during the summer...
A bit of Fate/Grand Order
And, from the spring
soon-to-be released Overlord Volume 12 The Paladin of the Holy Kingdom