Ravena Nightingale Updated Contract Symbol

I drew this today. Its an updated version of my black butler oc's contract symbol. I added the pentagram in the centre so it fits more into the black butler theme.  I tried to incorporate both of Ravena's nicknames into this. The roses for 'Demon of the rose' and two crossed raven feathers for 'demon of the raven' 

I apologize if it isn't as good, but plase let me know what you think?