Holes Book Cover - Color Application

Printed the sketch out on watercolor paper after making the critique changes. Mounted it on a panel using acrylic matte medium and then put a transparent gesso on top. Sanded once and then started with washes of gouache. Felt it needed the complement of violet in the sky. I let that dry and then lifted out the lighter areas. Trying out colored pencil on top to pull out highlights and deepen shadows. Experimenting.