There is no definitive answer to this question as it largely depends on the preferences of the buyer. However, there are some general trends that can be observed in the art world. For example, abstract and modern art tends to sell well, as do pieces with bright colors or those that evoke an emotional response. Landscapes and other nature-inspired works are also popular among buyers. Ultimately, it is important to remember that what sells best is often subjective and will vary from person to person.