The composition of both shots are great, ecspecially in the second one. However there are a few downsides.
In shot number one the bright light is too harsh and overexposed so the shot is very weak. Also the shot is a bit blurry. The focus needs to be on your models face.
Shot number two is a very good shot. The shot can only be improved in two ways. Have a lower exposure so that the people make a a darker silhouette or a longer exposure so you can make out more detail in them.
Your first image is out of focus, unless you were trying for a soft focus affect. On your second image, tighten up on the composition, there's a lot of open space above the subjects head, The eye will tend to pull away from the main subject, which is the bride and groom.
Hi,
As already everyone has told the first image is so blurry and not focused anywhere(may be the equipment has some problem).Also here the compositon is bad because the subject is not fully in the frame plus the object behind the neck in the left seems to be disturbing.May be you could have tried to focused on the models eyes + reduced the exposure + could have used the light falling on her from the right to get well contrast and shadowed image according to the expression on models face.
And the second shot is so good it just lack the composition as mentioned and the darker silhouette which could have made it look good.And on composing I think if you brought both the persons in the frame but positoning as you have done already could have made it good as here it has lost some portion of brides dress!