It sounds like a digital layout would be a great tool, even just for you to use.
If you really dislike some of your furniture, you should get rid of it. I also thing the bookshelves could go — those aren’t really an essential item in a bedroom.
Once you’ve cleared the room of unwanted items or clutter, grab a friend or two and play around with moving the furniture to different spots to create a better flow in the space. Sometimes you need to experiment to find the perfect solution! The first try might not work, but keep going until you’re happy.
If you liked the design of Eva’s room, freshen up your walls with a white or taupe color! But I would recommend keeping the rest of the colors in your room muted for a more mature look.