Which cover for the sequel?

I have two choices for the cover of The Search for Tzanáta, the sequel to Curse of the Tahiéra.
As you can see, the one on the right features the lovely artwork of Michèlle Ross, a black-and-white pencil drawing of Ayra, a new character, playing a moonlight harp for the Woodland Elven King. The one on the left features my favourite tree on Kefalonia, the island where my novels were conceived. They are equally beautiful in their own way, so I am having a hard time choosing.

Which cover should I choose? Comments are more than welcome!