portrait of Jiaqing Emperor vs. Portrait of Napolean
East Asian art is noted, when compared to Western designs to put much less emphasis on notions of grandeur, instead focusing on spiritual messages and intrinsic (traditional) values.
This can be seen also in comparisons of their architecture. This, it is argued is because the focus of their architecture is not on the physical details but often relies on the setting and interaction with the natural environment for their value and placing less emphasis on permanence of the original building.
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Can I expand this question to include middle eastern art such as this painting by the Ottomans? Their art is always pretty "unrealistic" looking
I recommend reading these comments by /u/webby686 and /u/farquier about the cultural context of art: