C&C please, photographs of my cousins wedding

Well i wasnt the official photographer for their wedding. I just had my new XSi (had gotten it a couple weeks before) and wanted to play around a bit... shots taken with the kit lens. Just thought i'd get some criticism or whatnot from the pros. I'm very new to photography, only owned point & shoots my life... and I took these from my seat during the ceremony... guess im just askin if i have a knack for this sort of thing...

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Welcome to POTN!

Knack for what? The first is unposed and you can't see the bride, the third is just a snapshot with a cluttered in-focus background. Technically, the first one needs fill flash, the third one the flash is harsh and direct and the vignette is overdone. But many, you look great in a suit and the bride looks pretty happy!.