Having a tiny space does not have to mean that it will feel uncomfortable. Small rooms with big beds have that special cozy look. So, this is not a mistake. You can add a big bed!
When you design your tiny bedroom, always go for bright colors. They will make the room feel spacious and airy at the same time. Always use the space in the smartest way possible. If you are in need of a desk for working or studying, you can always have a wall mounted one. It will ave you so much space!