Ness that's such a pretty photo! It looks mostly real, they may have enhanced the green/lowered reds?
Cat they're fantastic photos! Sunlight rarely shows up in photos as beautifully as they do in real life though :-/ I think it has something to do with the exposure settings of the camera when you're taking them. If you wanted to tweak in photoshop, I guess you could try a manual bit of lighting; you could make a new layer, similar shape/size as the already-existing sun-beams, and fiddle with it's blur settings, overlay it perhaps...[act]has a tinker[/act]
Eg:
~Link~ ?
It's not perfect but with some tweaking you could do something like this, make it more subtle, etc.
The new layer was just white, I gausian-blurred the bejeezus out of it, and then did an overlay blend mode. Overlaying a layer that's white will enhance any colours behind it.
There's two photos I have kept (they're just so dramatic!) but I'm not sure if they're real or not either...what do you reckon?
~Link~ <- surely not real, right?
~Link~ <- ditto...