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From kingofmycastle@gmx.net:
This image would have more atmosphere with area lights, because of the smooth
shadows.

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From jaimevives@mixmail.com:
Excellent composition! Very cinematographic, and very well lighted. The only but

is that all the ellements of the building are uniformly textured. 
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From ZenPsycho@yahoo.com:
very detailed

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From mark.wagner17@gte.net:
The whole scene is far too clean for the aftermath of a 
battle.

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From youknow@ucan.foad.org:
I rather like the broken wall but the surviving bits seem
a bit too clean for that circumstance. I suppose the
contrast is itself an interesting idea.

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From delfeld@mailcity.com:
Though I would generally say that a fortress is not an object that resembles a
castle (they may be two different ideas), the image also shows some exploration
of the concept of defense.  That is, since this image shows both the defense
and the attackers (or the clear aftermath of such an encounter), it does
explain the idea of 'fortress' fully.