There are a few factors to consider. First, consider the height of the ceiling. If you have a lower ceiling, it's better not to choose a too large artificial palm. This can visually make the space smaller. If you have a high ceiling, a large artificial palm plant is an excellent choice to fill the space. It's also essential to pay attention to other furniture and decorations in the room. If there are already many large pieces of furniture, it's better to choose a smaller artificial palm plant to avoid overcrowding the space. But for a room with few furniture items that may feel a bit empty, a large palm is perfect.