It has a "old school meets new school" vibe with the somewhat traditional posing (flowers on the train) but more modern lighting. I think they will like it very much.
A very nice first effort. If you are looking for areas to improve, take a closer look at the composition. The dress runs VERY tight on the left border, which feels a little claustrophobic. The horizon is vertically centered: its usually more dynamic to get the horizon out of the middle unless there is a compelling reason to leave it there. In this case, it looks like you were trying to avoid WA distortion, keep a dramatic sky, and show off the dress... but I feel like if you'd maybe stepped back just a smidge and taken in even more sky you might have had something stronger. Alternately, you could crop out the sky a bit to further emphasize the gown. His suit seems VERY dark: can you get some detail back in there?
Might even crop in on her so not all the left side of the train is showing and see if that gives it that little something extra. I see what Evan is saying about the train being really close to the side...was just trying to think of some options you could try or play around with. I do like this shot though.
