Duality

Two sides of Viper queen.

To
I´d like to ask the club correctors for correction and advice about anatomy, colouring/shading and dynamics of this picture. If you have another tips/ reprimands, I´d be glad for them too.
Originally I was aiming for bright, happy feel and lighting of sunny summer day, to go with with mood of human part of White Viper and to contrast with her snake one - I´m not sure if it shows in the end. Also Viper´s  face not only seems odd, it in my eyes fail to be one of a woman who is still somewhat young but shows first signs of aging - what is a thing I was unable to portrait there, so I´d love on some tips about this theme too.

Thanks!