Is the purple bedroom feng shui good?

There is no direct relationship between Feng Shui and color. And your lavender is also a very good color (in promoting fortune). The bedroom should be in a color suitable for sleeping, and the walls of the house should be mainly white, which is good for people's vision and mood. If you are lavender, you can actually do it. In short, the color should not be too flamboyant or too dim.