Rebecca McDonald is one of those people who positively lights up when she smiles. Given that she's usually a cheery, bubbly person, it's a rare moment when she isn't smiling. She has many different smiles, though, and Rebecca is at her most radiant during happy moments in the company of her husband and family... Particularly private, "intimate" moments with her Ron. Which they have at every opportunity - which may be another explanation for why she's always smiling.
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This headshot is of one of my characters, produced by KawaiiJumi, who you can find over at http://kawaiijumi.deviantart.com/ if you're interested in some of their deals and commissions. And hey, you thought I'd get a Ron head shot and no Rebecca? As if. Those two are a matched set, baby... Which honestly means I should probably get more Ron art to balance out the number of Rebecca (on her lonesome, anyway) pieces...

Anyway, this is what I'd call the alternate version, though both versions make for perfectly fine refs. I guess the other one just felt "sunnier" to me, and therefore screamed Rebecca. You can decide which one you like better, as with every other headshot from Kawaii. :3 Have fun with the decision!