I think the Capitol, along with the stone it floats on, should be lowered, partially submerging the Capitol's stone (gray) into the stone covered with grass. The irregularities and roughness at the border should be covered with vegetation and an effect like a cloud, for example.

Added 2 minutes later
And in general, all the stones, in my opinion, should be the same color (that is, either sandy or gray, or if different colors are left, they should complement each other harmoniously).