I say this with love...
My mom wants to do a full-family photo for their Christmas card. I have an adorable photo of just the two of them and suggested they use that as their card photo.
She got all huffy and wants to use a hideous, cheesetastic photo from Disney World with Mickey and Minnie.
I refuse the send her the full-size photo until she reconsiders and have recruited my sister to help me in my quest.
Re: am I mean?
LOL!
This sounds like something I'd do... haha
However, if it's her Christmas card, and it would make her happy, then maybe it wouldn't hurt for you to let her do it. Of course you could send a card out to all of the same people with a photo of you and your beautiful family so then everyone would know that while you and the fam are all about having fun and being cheesy in DW, you also clean up pretty well!
(of course then you can tell your mom that she owes you and your sis one!)