Add a couple different colored throw blankets (with different textures too) at base of the bed to add dimension to the space. You could go with a cream/taupe and another soft accent color (no dark colors). Agree on the picture - I’d get one that is wider.

I’d add large pillows on the bed, maybe a bench at the foot if you have space. I think you need one more color in the room. What is the black art on the wall? It’s hung a bit too high; the center of art should be at eye level, about 56” off the floor.

Here are some inspiration pics that use your colors, and there are more ideas here: https://www.mcgeeandco.com/pages/shop-the-look-bedroom

Is the grey bed covering a duvet? If so I would add another down comforter to give it more fluff, as the bedding seems to be very flat looking. Then layer a white throw at the end of the bed. Adding a couple of smaller white pillows in front of your existing ones will add more life to it.

Plus I’m always a fan of adding a little bit of greenery to help liven things up too.

More layers on the bed.