This is a great still shot for a wedding photograph. I really enjoy the simplicity, the ease of understanding, the message and the composition is spectacular. I think the most noticeable artistic and technical element of this photograph is how well you’ve staged the objects within your desired color spectrum. The colors are analogous (beside each other the color wheel) and this gives the photograph an incredibly soft and gentle feel to it.
My only recommendation is that your photographic balance is a bit off. It’s not quite centered, but it also doesn’t abide by the rule of thirds. It’s somewhere in between. It doesn’t look bad, but I think it would look slightly more interesting and dramatic if you pushed the main objects off center a little bit. Move them closer to the left of the photograph by positioning yourself and your camera slightly to the right.
I think that would really help give this photograph some extra punch.