Culinary Chronicles of the Court Flower Premium Ebook - Cover Illustration Quality

[Silver Sugar Duchess]

I noticed after downloading the premium ebook of volume 1 of Culinary Chronicles of the Court Flower, that the quality of the front cover illustration isn‘t as high as of other premium ebooks. I don’t mean the overall resolution, but the lines aren‘t smooth at all if you zoom in... It looks a bit like a child tried to draw with a pencil on a sheet of paper which lies on an uneven surface, if you know what I mean.
It‘s something what I usually really hate about ebooks and one reason why I really love your premium ebooks, since it‘s guaranteed to get high quality illustrations. Only this time I‘m not satisfied with it.
I already checked it and the lines shouldn‘t be this crinkled. Besides the characters introduction (only Rimi, Tama and Shusei) the other illustrations in the volume are fine.
If you look at the front cover illustration of Apparently It‘s My Fault that My Husband Has The Head of a Beast which was drawn by the same artist, you will clearly see the difference in quality.