I recommend two professionals to sell these things.
1. The painting shops at the entrance of Zheng Tie No.6 Middle School (50m from Zhongyuan Road and Jingguang Road) are all professional. Some of them are old shops, such as Zhiyingzhai, Erqi Painting and Calligraphy Club and Huanghe Painting and Calligraphy Club. There is also a flying swallow across the road. There is a big river gallery in the west of the school gate-there are several chain stores in Zhengzhou (there is also one in the east and south of the intersection of Nongye Road and Wenhua Road), all of which are professional painting shops. Everyone in old Zhengzhou knows that Liu Tie Middle School is a professional art middle school, and its popularity and strength are not even as good as those of some universities. Of course, it is also the old school in Zhengzhou. So the painting shops over there are all very professional.
2. There are several painting shops at the side door of Block A of International Commodity City. You can also go there. (that is, opposite the back door of Jinlin Small Commodity Market, that is, to the west of the former Dongfanghong Cinema, that is, the railway station)
I hope this helps.