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From kingofmycastle@gmx.net:
Too simple!

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From tony@awmcs.net:
Your bricks technique worked pretty well. The rest of your textures are rather
simplistic. Play around a little with the patterns and surface normals to add
realism. There are a lot of programs out there to help with heightfields. I
have heard a lot about leveller. Also if you know th right color codes you can
custom make a heightfield pixel by pixel. (There has to be a tutorial somewhere
about this.) 

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From extrememarinerfan@home.com:
There is nothing in the castle!
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From ZenPsycho@yahoo.com:
the water is too blue and the landscape is too green.

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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.