If you are talking about a specific set of Qajar paintings that has previously been mentioned or is understood from general context then "the Qajar paintings" is correct. If you are talking about Qajar paintings in general then probably you should delete the article. g.
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soheil1With regards to the three-category system of Peirce, icon, index, and symbol, and its different aspects, in Qajar paintings the staff has an identity rooted in the Qajar culture and society."With regard to..."
soheil1Thus, by the knowledge of semiotics, we can explore a new field of analyzing the artistic arts, not only in the Qajar artistic period, but also in other periods like the Safavid period, the Timurid period, and so on.The articles are OK.