The pyramidal blocks in the middle look a bit shallow, I think the illuminated faces should be as bright as the highlights on rims of the other tiles, if not brighter.
Also, you are using the same middle color on the internal diagonals like they where an opaque 3d mesh defining the tappered shape of the blocks, but they are edges of a solid and should be highlighted on north and west like the rims of the rest of the tiles.
Edit: I can also suggest that you could drop at least one shade on the hopscotch brick pattern, the internal shading inside each brick is barely visible, and it feels a little pillow shaded no?