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From kingofmycastle@gmx.net:
Nice sky and ground.

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From mark.wagner17@gte.net:
The scale of this scene is inconsistent.  The cracked 
mud ground makes the castle look very small and 
nearby, but by your description, it is large and in the far 
distance.

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From delfeld@mailcity.com:
How does this relate to the concept of fortress?  A fortress is not an object
that resembles a castle. . . they may be two different ideas.  

Centering is usually too obvious to be interesting. . . you have to give the
viewer something to think about in terms of placement.