Well, it would have been easier to shoot it using an ND grad filter so the foreground wasn't so dark.
Did you shoot it as a raw file? If so, open it up in PS, expose for the foreground and adjust your WB so the blue tint is gone. Open that file, save it as a tif, then open the raw file again and expose for the sky. Paste that onto the tif file, add a layer mask, and grab a brush and start painting to match the two exposures.
Like I said, it's almost always a timesaver to get a shot like this right in camera and you won't be able to do that without a ND grad filter.
My interpretation of it is that the color balance is not very far off. The sunlit part is fine, it looks believable for late afternoon daylight white balance. That might be why you're having a hard time with it: Half the photo is not wrong, so the part that's right will be made wrong if you make a uniform adjustment. The bluish tint only appears in the shadows, which might be explained by something every painting student is taught: The shadow of warm light is cool. In Lightroom or Camera Raw I might try a single angled graduated mask that changes the Color parameter to warm up the shadow, or in Photoshop a single Photo Filter adjustment that adds warmth, with a graduated mask at an angle.
Here's a 30-second Photoshop try at it. I left the daylight part untouched, and changed only color, not lightness. Of course you can warm it up any other way or degree you like...
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Did you shoot it as a raw file? If so, open it up in PS, expose for the foreground and adjust your WB so the blue tint is gone. Open that file, save it as a tif, then open the raw file again and expose for the sky. Paste that onto the tif file, add a layer mask, and grab a brush and start painting to match the two exposures.
Like I said, it's almost always a timesaver to get a shot like this right in camera and you won't be able to do that without a ND grad filter.
Portland, Oregon Photographer Pete Springer
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Here's a 30-second Photoshop try at it. I left the daylight part untouched, and changed only color, not lightness. Of course you can warm it up any other way or degree you like...