Daniel Arriaga for UP: 1. Accurate volumes and perspective with irregular details. Harmonious color scheme: base colors with colorful small touches. Details have the most important role here. Props add a lot of life to the environment. 2. Consistent distribution of details throughout the composition. Same level of polish, look and attention in all of its parts, be it empty areas, textures or lines. 3. Cosy feeling. Also shows a bit of the personality of the environment's inhabitant(s).