Artist's tweets (loose translation):

Someone uploaded my artwork to danbooru and it got only two rate counts and one notification (favs/comments) on pixiv. I wonder if the guy who saved it pressed pixiv's evaluation button... (I never uploaded the image except to pixiv.)

I don't mind people reuploading my art, but if you like my art and want to reupload it why not just press a simple 'LIKE' button. I would be discouraged by the lack of (pixiv) responses.