I- just adore how you used color for this piece. You kept them to a very select few and it works so beautifully. (Warm colors in contrast to cool is just eye catching and lovely)
The subtle touches of colors makes Chie and Kou stand out in the picture plain along with the triangular composition that draws your eyes from the umbrella to the characters, the puddle and back. I also really like how lanky the characters look, the lean way you drew them stretches things out in just the right way that you're gaze lingers on them for ages.
I adore this to pieces, so I must favorite it! Awesome work!