Character Artist @Blizzard_Ent - I make polygons, do art things, and play a LOT of games | Dumb as they might be, my opinions & posts are my own. 
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Consider this though - you will pretty much never be working on fanart in a professional capacity outside of maybe doing toys/figures so it's to your benefit to practice recreating another artist's concept more often than an existing character. Fanart is great, but in moderation.
Whether or not you use your own concept instead of another artist is totally a judgement call, albeit one you have to be VERY honest with yourself about. I trained as a concept artist in school, decided to switch to 3D, and even I don't completely trust my own design skills 100%.
