Error Concealment | JPEG | MPEG-4 | Wavelet | YUV

Hi all. I have some photos like these

http://img365.imageshack.us/img365/5240/20070330185824ui5.png
http://img502.imageshack.us/img502/9265/20070331144139ss5.png .

My problem is that the curtain doesn't look realistic relatively to the window (background
image) .  I have tried smoothening and sharpening the image but the result wasn't what i
expected. As I am new to image processing I would appreciate some advice on which filter(s) i
could use to make the images look more real. 

Thanks in advance

Stelios G.

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