In romantic art songs, the role of the piano is to

improvise based on the singer's melody.

Piano accompanmint was to be with solo voice.  This Included other instruments such as cello, etc.

Hope this helps.

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artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.