Andrew, thanks for posting these. Yes, this is what this forum is for, posting our own work and getting critique. The "Art Museum" forum is for other things, not for critique, not our own. This could be exhibits you have been to or artists you like and want to share.
Normally we do one at a time but, as this is a series, it can be one thing.
I would like to know more about this series. It's based on myths as you said, but I also see a theme of autumn running through it. Is that right?
I think you have a really good eye. Even being new at photography, that good eye jumps out. Echo is stunning.
Now for the nitty critty - Changeling could be a bit clearer in what that is lying beside the person. I can't recognize if it's wood or a corpse or what. Charon is not in focus. Out of focus areas can be used to good effect in photography but usually with a focal point that's clear, or maybe with varying degrees of blur - this looks accidental.
I would love if you would post the other images for us and tell us more.