Very well done orchestral writing! Pedal points, doubling and all of these types of techniques do wonders to a cinematic ost like this one!
I liked how Whispers of Thalassia is a nice divergence from the rest of the music, and it shows flexibility as a composer. The only thing I wish is that you did more of it - a little more variation could really help spice up an OST, though it should be fitting to the theme and the composer's vision of the music. But of course, this is still great, and definitely deserves lots of praise!
Great job!