A art classroom in Engpsh can be referred to as an "art studio" or an "art room".

来源：这个说法源自于英语中美术工作室和教室的常用词汇。

Example sentences in Engpsh with Chinese translation:

"I take art classes in the art studio at my school."
我在学校的美术工作室上艺术课。
"She rents an art room for her private painting lessons."
她租了一间美术教室用于她的私人绘画课。
"The art room was filled with paintings and sculptures."
美术教室里放满了画和雕塑。