Yes I love their work! I bookmarked their page incase I want to use some of the others as icons in the future.
And ooh I've probably seen every picture of Whimsicott in existence now, ahaha. xD;; I saw all the Whimisicotts on pixiv and tumblr so there's not much left. awaiting more~
About your avatar, I've seen that person's work before. I really like the one they did of the Kalos starters and Sylveon. They were my faves of those, but the Whimsicott one is super-adorbs as well.
I should really dig up some more Whimsicott fanart that might make a good avatar for you or something, since I usually dig deep when I'm making my avatars.