Thanks for sharing Gurry - these aren't bad for a start. You obviously were working hard to do a good job.
I'm trying to remember what gear you said you were using.... but that first looks like your big zoom? Obviously no fill flash, but I like the side lighting like that. Once you crop it down it will enhance the composition.
Balcony Shot - not stunning, but a good shot.... one of those expected shots that gives a good overall record of the ceremony. But it's still pleasant and you'll be able to bring up the shadow detail in PP a little bit.
On the Stairs - nice surprised look. Here's also where fill flash can help out to "even out" the exposure a bit and get rid of the hot spot on his face. For the final editing you may want to consider a vertical crop, removing the camera girl. She doesn't really add much.
Trio Shot - please don't take this the wrong way, but this is not an attractive shot. It looks like flash was used, but is was either onboard, or flash in hotshoe and not on a bracket. I can see the reflection in his glasses, and a bracket would usually eliminate this. The venue is not good either. I know attractive backgrounds are sometimes hard to find, but perhaps there was something better....
The Couple Gazing - It's fair. I would have come in closer, moved them closer together, perhaps had them gazing at each other, large aperture to throw the background out of focus, concentrate on them.
The Dance Floor - In unattractive halls I try to get close in to the couple, cropping out much of the background. I would get them from waist up, or a 3/4 length shot, having them face the camera, each other, and maybe cheek to cheek. Here the hall detracts from the handsome couple. Here is also where flash can help out too, even though there WAS enough light for the shot. The QUALITY of the available light is poor; it is flat and lacks contrast and leaves unattractive shadows on their faces. It is not an awful shot, but it could have been better with flash use.