Is this right?

I was out in the fog and general autumnal mist and mellow fruitfulness yesterday and snapped a quick image of some horses in a field. I liked the tones within the photograph and the way that the fog created a backdrop that just silhouetted the trees at the edge of the small field.

Then just a was dropping off to sleep last night my mind revisited the picture and I wondered what it would look like with a Bride and Groom instead of the white horse on the left - so I found a photo of a couple I thought might work...

An hour and a quarter in Photoshop later (my photoshop skills are fairly rusty as you can tell) I had my picture (see the top of this post). But the question is - should this ever be done?
Were my skills better, or I paid to have some proper post-production work done with the images, this could be a very convincing image. But should it ever be used commercially.
Personally I would never have the image on my website as it doesn't represent what truly happened on the day with this couple - they never walked in that field, the wedding and the field are 90 miles and 9 months apart! But had the reception been next door to field and they were up for it I would undoubtable asked them to create this shot.
As a photographer I could go and photograph St.Paul's Cathedral, Balmoral or the chicest boutique hotel and drop images of wedded couples into the pictures to advertise me as a photographer - but I don't think I ever should. Websites should be honest and show couples the style and a true representation of the images they will get from their weddings. I do post-process images to bring out the elements I want the viewers eye to be drawn to within the frame - to aid the narrative flow within the picture but I could never tell a lie! (How very George Washington)