I wouldn't call myself a photoshop expert, but I will post a recent photo that I had to do a perspective adjustment on...
This is before any photoshop work. I just opened the RAW file in Camera Raw and zeroed out everything...no sharpening, no levels adjustment, no white balance adjustment, etc. Then I just resized it for the web.
This is after I worked on it...
Here's what I did:
Obviously I attempted a perspective correction. This is the first time I've ever done it so I'm sure it could have been better.
I cropped out the two light poles in the yard. I considered cloning out the one toward the back, but I left it since it wasn't so intrusive.
I did a levels adjustment and added some contrast and brightness.
Then I did a little bit of sharpening - it might need a little more.
Finally I converted to 8 bit and resized for the web.
Now, if I was a photoshop expert, I would've made it look like there was a light on in the church lighting up that huge stained glass window.

I don't know how to do that or even if it's possible.
Edited to include new PS attempt. Inspired by Billy, I tried to get the color to come out of the stained glass. I duplicated the image and then I started tweaking everything - levels, saturation, gamma, brightness, contrast, etc. until I got some of the color out of the glass. Then I moved the original photoshopped image over the one that I optimized for the glass color and I erased until the stained glass below showed through.
