Artists Studio Thread, False Window

I'd need to learn how to apply a more natural texture to the window to make this look more convincing. There is no such window or brick wall. These were created using Xara Xtreme. Guildford Castle Keep is real enough. Sit the photo behind the false window and wall for the finished image:

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I like the idea, Mart.
But the 'window' looks rather like a prison cell one.
Er, not that I have had personal experience you understand.

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XP Pro. Canon SX100 IS. Photoshop Elements 2.