correction

The purpose of art being in a first place enable the artist to express themselves feelings it would be restrict the artist in his field than asking limits this that it can or not represent 

Cette phrase est trop longue. Et, traduis moi en français ce que tu as voulu dire, car la formulation n'a pas l'air correct. Privilégie des phrases courtes et simples.

Indeed by preventing the artist represent such or that is forbidden s express such as?? sens? , it seems its own work which may be considered such as infringement speech to freedom or even some readable manner to freedom of thinking . Such cas?? may be identifiable especially in diets dictatorial or oppression censorship and manipulation mediatic are omnipresents .
Of the cas tell us that freedom of the artist must be total

Tout cela n'est pas très clair, j'attends ta traduction

Le but de l'art etant dans un premier lieu de permettre a l artiste d exprimer ses sentiments

The purpose of art is allowing the artist to express his feelings.

ce serait de restreindre l artiste dans son domaine que de poser des limites sur ce qu il peut ou non representer . Je ne comprends pas ta phrase! qu'est ce qui serait de restreindre l'artiste?bref je te la traduis quand même.

it would be to restrict/limit the artist in his domain/area "que de poser, du sens au lieu de"? limits on what he can represent or not.

En effet ,en empechant l artiste de representer telle ou telle chose on l interdit de s exprimer comme bon lui semble sur sa propre oeuvre ce qui peut etre considere comme une atteinte a la liberte s exprimer voire d une certaine manniere a la liberte de penser

Indeed, if we stop the artist from representing something, he can't express himself as he wants on his own work/etchings..