Much of his work also involves developing art for film and television, having now created for more than 200 projects. His current projects include conceptualizing and sketching art for Disney's "Bolt", "Curious George 2", "Journey to the Center of the Earth" with Brendon Frasier, and "My Name Is Earl" with Jason Lee.
Anyway, amongst his various drawings in his gallery, he has a total of 5 pieces indicated as being "Voyage of the Dawn Treader Poster Concept Sketches" (3 can be found in the posters folder, 2 can be found in the sketches folder). However, it should be noted that there is absolutely no other information to say anything about these sketches - whether or not they were done as officially contracted work from the studio, whether or not he did them himself for his own pleasure, when they were done, whether or not they were rejected, how much information he was given when drawing them, etc etc. They could be at any number of stages of incompleteness and they could of been used to illustrate any number of potential concepts.
So don't read too much (if anything) into them, though they are however very much worth checking out. At the very least, they are some of the best sketches of the movie-design Dawn Treader i've seen yet. You should be able to see all 5 pieces by going to this link:
http://sturckestudio.com/site/#/gallery/narnia/
A few points to note on the main black and white poster sketch (which would appear to be most similar to a standard poster design) - Although the Dawn Treader is drawn in the style of the set at Cleveland point, Caspian is drawn in the style in which he appeared in Prince Caspian, and the drawing of Reepicheep is in the exact same pose as he appeared on the PC poster. And yes, that does appear to be the White Witch on the right hand side, but there are any number of reasons why he may of thrown that in there as part of a rough concept sketch, so don't worry about that.
I would treat it in very much the same vein as the concept sketches we saw a while back for possible VDT toys - they had been drawn with some basic known concepts from the new movie, but were predominantly based on visuals from the Prince Caspian movie.