Charming: She had lots of lovers and so I assume that she would be really charming.
Peaceful: From what I've found she was never really engaged in any sort of combat so she's pretty peaceful.
Graceful: She rises every morning to change the night into morning and the way they describe her doing it makes her seem graceful.
I believe that Eos is one the most under looked Greek Gods she is much more important and contributes much more then what is usually shown.
I believe that what the mortals of that time valued or wanted is someone to serve or worship becaus they glorified the gods especially Helios and Eos.