Aniconism is important for Islamic art because it is usually forbidden to depict things from holy scriptures in art. This is why Islamic art has usually developed in the form of Arabesques for example or other artistic forms that do not depict actual parts of the physical or metaphysical world. If the art pieces start getting destroyed because of aniconism, it's called iconoclasm.
Facade's are an important part of Islamic art because of the aniconism idea. This is why things like temples or palaces had carvings on facades that were either in forms of arabesques or were done to show a relief or anything similar. They are often great feats of architecture since it required great skill to make facades at older times.
Qur'an is important for Islamic art because it of two reasons. One is that there are guidelines on what can and what can be presented in art for various reasons that are spoken there. Another is that many copies of Qur'an are pieces of art on their own because of illuminations which i when the Qur'an would be copied with magnificent artistry drawn or painted around the texts.
Aniconism is a movement of not practicing the worship of icons. This somehow influenced Islamic art with its geometric designs and caligraphy. The facade is the bulding's exterior front. It is usually desinged by rounded towers that readily identifies Islamic art. Qur'an is where religious texts are compiled. It is highly recognized as one of the finest works of Arabic literature.
The answer is never because GDP per capita depends on GDP and population. Countries with more people have the potential to make more goods and services. But, having more people also lowers GDP per capita, because more people have to share these products.
