I really like the dark, foggy mood you've established across all four pieces. The consistent color palette shows great artistic vision! To take this set to the next level without losing that misty feel, I would recommend adding a few elements to give the viewer a sense of scale. For example, adding a tiny silhouette of a bird, a falling rock, or even that same creature in the distance would make the cliffs look massive. You could also add some subtle, pale highlights to the very edges of the rocks to help define their shapes against the fog, or lean into the watercolor look with some splatters or drips to make the texture feel intentional. Right now, it's a great mood piece, but a little bit of added scale or edge definition would make it feel like a finished world!