HelepolisH said: According to Pixiv, the large Reiteisei momiji art is also on his website so searching. And takahina has the same as well. Concluding the artist is: 'takahina' but anybody feel free to doublecheck.
eidolon said: The artist is kazami_mioyoru. Use the direct image URL and the Find Artist function will work if there is an artist entry for them.