comply, complying, agreeable
娓 centers on a gentle, agreeable compliance: willingly following along or being pleasant and accommodating. The meaning of beauty (うつく.しい) is a natural extension of this graceful agreeableness.
娓 combines 女 (woman) with 尾, which likely contributes the sound and may relate to following or trailing, giving the idea of a compliant, agreeable manner.
A woman (女) with a trailing tail (尾) follows along gracefully and agreeably, always complying with the flow.
For ビ, imagine a bee (ビ) that is unusually agreeable and compliant, gently following the woman's movements without stinging.