I agree! Her smile and the sparkle in her eyes fit Tolkein elves to a T
It is perhaps not unnatural that in England, the land where the love of the delicate and fine has often reappeared in art, fancy should in this matter turn towards the dainty and diminutive, as in France it went to court and put on powder and diamonds.
Yet I suspect that this flower-and-butterfly minuteness was also a product of rationalization, which transformed the glamour of Elfland into mere finesse, and invisibility into a fragility that could hide in a cowslip or shrink behind a blade of grass.