Nice sketch mate! Good crisp shadows always get a thumbs up from me as its a big area that people fall down on (me too until only recently!)
Look forward to seeing more soon!
Oh, and welcome to the boards! :)
Nick
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Digital Matte Painter // Forum Moderator
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The icebergs looks really good, I like them a lot. The only thing I would do is add something to the water, maybe some small ripples or more shadows or reflection. It's a little hard to read as water.