Ivan Fomin has some pretty nice fan art in his portfolio.

Captain Hook:



Daily Sketches Week #3:






Winter Bloom:



Panda monk:



Blood Knight:



Hunter on Hunter:



He's recently started doing some official Hearthstone card art.

https://www.artstation.com/artwork/1V0m3
https://www.artstation.com/artwork/DJrqo
https://www.artstation.com/artwork/eLJKZ

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