I know HERE (http://shishitora.web.fc2.com/illust.html) has some fanarts of Guilford alone and with Cornelia. Also, some of just Cornelia and Darlton. Some images aren't particulary worksafe XD; It is in Japanese but you can tell it's the first set of links on the left.
I'll comment if I find some more. I'm sure I have some others favourited.
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I'll comment if I find some more. I'm sure I have some others favourited.