She seems a bit more worried in the picture than she does in the story. She seems maybe the way old Rarity would be if stupid sexy nekked sweaty RD showed up at her wedding.

Decent expression, scrabbly execution.

I'm not as clear as what you wanted to do with this one. I can usually see your intent in these sketches, but outside of Rarity obviously having a stressed expression, there's not a lot of support for the mood. I think this is an experimental piece... the brush strokes do look like watercolors or something like that, to my untrained eye. It's definitely cool that you've tried using a different medium, but it does have the unfortunate effect of making Rarity's hair look a bit spaghetti-ish.