This is Feng Zhu, exceptional professional Concept artist for a myriad type of projects; film, TV and games.  I love his skill with loose painting.

Because he's got mounds of knowledge about value, contrast, composition and color - his work looks excellent even in this sketched and loose manner.  In fact this video is about doing 4 thumbnails in about 2 hours to show to an Art Director for MMO landscapes.

You can find his work here  He also runs a school :)
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