Significant problems with all four I'm afraid, Peter.
The main one is about five degrees off-kilter, which you can fix easily.
More seriously the image demonstrates why you need to diffuse, or at least bounce flash where you're taking these indoor portraits. You're holding the camera on the right with the flash mounted on the top - the obvious and ugly shadow illustrates this. On top of that you've got differently coloured highlights from the overhead lighting. Combined this is very unflattering for any portrait photography. (Your flash is meant not simply to give sufficient light, but to evenly spread it on the subject in this type of thing)
The second, of the venue, just doesn't do anything. Buildings by themselves are often not very interesting - why are there no people in this? Was there not a better angle. Could you have avoided having chopped-off bits of hatchback in either corner?
Shot 3 is no better - not a great angle, feet chopped off, parts of the dress chopped off, bride looking one way, groom looking the other, again off true by an amount that suggests a lack of experience. The guests are randomly placed in an unbalanced composition.
Shot four is the poorest of the bunch - the others are at least all in focus. But the gaze of the party does show that you were'nt the principal photographer here - lucky, because I doubt you'd be paid for these.
I know this sounds very harsh, but I hope you will appreciate the criticisms are meant to be constructive and that you will be able to reflect on them and apply the thought to the next time you have a go at something like this.