First, I selected the sky and added a touch of blue to it.
I didn't use any special settings, just those that the application set depending on which style of painting I selected in the right hand pull down (under "Auto-painting")
Then after that was finished I went to the "Apply Surface Texture" and selected
"Image Luminance" under the "USING" pulldown. The settings in that area were those that i found most pleasing.
I am enclosing two screen shots of the settings I used for this latest rendition.

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Gunner Holmes (B52 Tail)
PhotoShop CS2, Corel Painter IX, Corel Painter Essentials 4, and Nik Efex Pro v3.0 on an old G4with an upgraded processor to 1.8 ghz