This Room is Too Bland
Minimalism is nice, and having furnishings and walls that are similar neutral colors opens up a lot of design opportunities for your space. However, if your space is completely devoid of color, it's going to end up looking loke a doctor's office. Additionally, if you have too many muted colors in a room, it can look drab and uncomfortable...
Lighting is Key
Keep in mind that lighting is the most important factor when trying to make a room less boring. You can get away with using a lot of whites and beiges if you get a lot of natural light in a room. If your room doesn't have a lot of natural light, make sure that you use paint and furnishings that compliment the lighting that's available. Make sure that you add pops of color as well. Plants, paintings, and colored furnishings can do the trick.