Art reflects the class nature of those who draw it. The totality of the class a person belongs too and the whole life experiences of the person of that class, etc. along with the natural development of the productive forces and of consciousness. Postmodernism is reactionary and "abstract" art reflects more upon the person who paints it than of the painting itself.

This is why socialist realism existed. As Hoxha noted in 1965: "In regard to literature and the arts which are developing in our country, as in regard to the other issues, there are not two moralities, but only one, the proletarian morality of the working class. The ideas expressed in the works should conform to this morality. A work devoid of ideas and of this morality may occasionally appear to be of some limited interest from the viewpoint of its artistic skill, but from the social ideological viewpoint it cannot have any value."

Also: "There are some who think, and think mistakenly, that by making a flying visit to the base, by sitting in a café, cigarette in hand, in order to see the various types whom they want to put in their work passing in the street, or who think that by walking through some factory or plant, they have gathered the necessary material and go home, where they start to write superficially, and sometimes entirely back-to-front, about those things and people that they 'photographed' in passing. Thus the world of such a person is restricted by the narrow petty-bourgeois concept of the role of the writer, and he thinks that his head is capable of doing great things. But can it be said that the engineers of the hydro-power stations or those who drain the marshes do not work with their heads, and that the writers alone have this privilege? No! But the engineer, quite correctly, works with the people, studies the environment, the nature, draws plans, checks them again with the people, with the best experience of others, encounters difficulties, struggles with them till he overcomes them. But should not our writer and artist work in this way, too?"

Etc. See: http://www.enver-hoxha.net/librat_pd...per_people.pdf

On socialist realism in literature specifically, see: http://www.marxists.org/subject/art/...ress/index.htm