The colour palette is really on point. You're using complimentary colours properly, and the richness is enjoyable. I especially like the designs of the environments, even if they aren't all that fleshed out in the sketches.
One thing I would comment on, however, is how in your rocky valley bridge image, the fade into atmosphere seems a bit too sudden. You've got mostly foreground colouring in your cliffs, but then beyond that it turns into what looks to be mid-ground details (the blue mountains with points) coloured as though it's incredibly far away.
Also, you have this orange wash covering these mountains as lighting, I assume from the rising or setting sun, but that orange wash isn't seen anywhere else in the background where it should also be washing over, albeit less saturated. Doing so would help tie those further back mountains into the picture better.
