Originally this only had Yuuka on a very different landscape/lighting, but it didn't make much sense so I changed it entirely. Later on, I felt like Yuuka was too lonely, so I added Cirno to enjoy the breeze with her. But Cirno and Daiyousei are two but one, so I added Daiyousei as well. Now we have 3 cute girls enjoying their time.

You can read more about the development of the drawing here.