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From kingofmycastle@gmx.net:
Too simple!

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From tek@evilsuperbrain.com:
That castle seriously needs more varied textures. That grey hides the detail.

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From tony@awmcs.net:
This image has a lot of potential. Make the image a little bigger. I find 800x600 just about perfect. The textures should be a little more complex. I really love the mood of the picture. It is tranquil yet ominous.

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From mark.wagner17@gte.net:
Without knowing how the image was created, I cannot 
give it a technical merit score.

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From delfeld@mailcity.com:
The concept of fortress is not necessarily contained by the image of a castle.  What, then, is the idea of fortress in this image?

Try using individual textures for each building and surface.  With one texture, it looks like a minature, as if it was carved out of a small stone.