The Gul(flower) concept art gallery gives a good glimpse into the design process, from taking inspiration from real life to re imagining it for the context of the story. A lot of the design process is about how you think about each element to make intelligent choices that drive the themes and purpose of the story home. A lot of time and care goes into each decision, while trying to balance the desire for spontaneity to bring in fresh, seemingly unrelated sources of inspiration into the mix.