Although Aleksi Briclot is new to Magic illustration, having debuted in Champions of Kamigawa with Oni Possession, he's no newcomer to otherworldly illustration. He's an established video game concept illustrator and comic artist (see his website). His other artist credits include Aura Barbs and the Limited powerhouse Horobi's Whisper in Betrayers. Welcome aboard, Aleksi!
The first step of the creation of a card's art is its art description. The art description tells the artist what the card will do, what its flavor is, and what the mood of the illustration should be. Here were the instructions given to Aleksi for Flames of the Blood Hand:
Show a red-aligned ogre who knows how to use fire magic and is casting a powerful damage spell. From his hands or some magical object we see this brilliant white-hot fire attack of your design. This is supernatural fire that can't be extinguished, so maybe the flames are a strange color, or seem stylized/otherworldly somehow.
Along with the art description, Aleksi would have had access to the Kamigawa style guide to see concept illustrations of what ogres look like in Kamigawa -- for an idea of what he might have seen, check out Sokenzan Bruiser, Villainous Ogre or Ogre Marauder, for example.
The next step is to submit sketches of his vision of the art description.
Here's Aleksi's full-color initial sketch submitted for Flames of the Blood Hand:
Flames of the Blood Hand sketch 1 by Aleksi Briclot
There was some concern that the pose of the ogre looked as if he was being struck by a flame effect rather than producing one. But as you can see, there's definite potential here for a mean, nasty fire-spell. Here's Aleksi's second submission.
Flames of the Blood Hand sketch 2 by Aleksi Briclot
Here you can see much more clearly that the ogre is the agent here, in command and ready to blast the viewer. His claw radiates that supernatural, unavoidable heat from the art description.
In the finished art, Briclot refines the flame effect with cool tracers and sparks, and the detail of the ogre's armor becomes extremely polished.
Flames of the Blood Hand final art by Aleksi Briclot
And here's how you'll see the card in its final state, in booster packs of Betrayers of Kamigawa. Get ready to burn out your opponent (with a little help from Aleksi Briclot) with Flames of the Blood Hand!