While 图画 (túhuà) itself is a simple, everyday word, it connects to the profound value of art in Chinese culture. Calligraphy and painting (书画, shūhuà) are considered among the highest art forms, historically practiced by scholars and officials. A simple 图画 is the first step a child takes toward this rich artistic heritage. A key cultural and linguistic distinction is how Chinese separates created images from captured ones.
图画 (túhuà) is most frequently used in contexts related to children, education, and general descriptions.
Its connotation is neutral and generally informal. In a professional art gallery, while not incorrect, calling a masterpiece by a famous artist a 图画 might sound a bit simplistic. In that setting, it would be more appropriate to use a specific term like 油画 (yóuhuà) for an oil painting or 国画 (guóhuà) for a traditional Chinese painting.