I love the ambiguity of her pose. She's probably laughing, but she looks like she might be repulsed. And he is absorbed by her. Great candid capture. I don't know if the grain is adding a lot, but maybe it is giving it a kind of journalistic feel. 7
The grain parts could be OK in their own right but they don't seem to sit well with the blown highlights on her dress - it doesn't say "artistic choice to add grain" so much as it says "failure to reduce contrast with fill-in flash" to me.