Very nice quilt. I would approach it a little different. I would stitch around each figure and do a little echo quilting around each, but no more than two or three lines. Between the echo quilting I would do some free hand quilting like small stipples, loops or twirls. I would try to use the exact same color in each area (red on the red area, yellow on the yellow area, etc). I would free hand quilt stars on the sky using black thread.
Good luck,
Maria