There are mirrors about 18" x4' intended to be attached to a bedroom or bathroom door -- by the window it could reflect that natural light. Would add white vinyl miniblinds to the window to visually minimize the limited nature of the "view". Consider adding stained glass decorations to the window itself, collecting a few smaller items you particularly like -- I've found a few relatively inexpensive Tiffany style ones at antique&more stores and thrift stores. https://www.delphiglass.com/pre-cut-kits/home-decor-votive-kits/pre-cut-birds-trio-kit that can be attached to the window with suction cups. https://www.etsy.com/se-en/listing/268266558/stained-glass-suction-cups-10-with-metal Add at least a curtain if not a door to what appears to be an open closet opposite the door by the window. Add tall, shallow cabinet with doors as wide as will fit in the indent to the left of what appears to be an open closet. [https://www.houzz.com/products/storage-cabinet-prvw-vr~100627544?m_refid=PLA_HZ_100627544_954742044[(https://www.houzz.com/products/storage-cabinet-prvw-vr~100627544?m_refid=PLA_HZ_100627544_954742044&device=c&nw=g&gclid=EAIaIQobChMI-YCYooPG3QIVCcDICh0a-wdCEAQYASABEgLrk_D_BwE) See if you can find a bookcase headboard or lights that either clip to whatever headboard you have or hang on the wall rather than take up space with bedside tables. Choose bedding with a light background and at least a couple of your favorite pastal colors, with pillow shams to match. Lighter colored bedding will visually make the room seem larger than darker colors. Do iron the bag with the cherries. If you don't use the bag with the cherries as a bag, you might cut out and frame the one side of it with the cherries. If you use the bag as a bag, invest in a hook to hang it at a convenient location -- perhaps a magnetic hook attached to the refrigerator. Alternately, since December is approaching, you might find a hook intended to hold a holiday stocking on a mantel that would let you hang the bag from a windowsill with it -- something that could be used year round ... perhaps only a heavy metal star.

On your bedside left wall you can hang decorative wall watch, art, decorative mirror,corner shelf or wall mirror. A wide range of empty space allows you to choose many things. You can also add glass table in your room in front of sofas.. https://www.houzz.com/products/alpha-glass-coffee-table-stylish-base-white-prvw-vr~84539014 https://www.houzz.com/products/modern-style-mermaid-coffee-table-black-prvw-vr~53322772 https://www.houzz.com/products/corner-clear-glass-shelf-kit-6-x6-with-chrome-brackets-triangle-10x10-prvw-vr~44792984 https://www.houzz.com/products/floating-rectangle-clear-glass-shelf-kit-clear-8x24-prvw-vr~44792814 https://www.houzz.com/products/bent-glass-shelf-gravity-series-1-4-thick-with-brackets-prvw-vr~44814681?lid=31866314 https://www.houzz.com/products/bent-glass-shelf-chase-series-1-4-thick-with-brackets-prvw-vr~44814686?lid=31866316 https://www.houzz.com/products/fab-glass-and-mirror-stylish-frame-wall-decorative-round-mirror-prvw-vr~84538943 https://www.houzz.com/products/fab-glass-and-mirror-di-amore-stylish-sunburst-wall-mirror-design-prvw-vr~84538946 https://www.houzz.com/products/fab-glass-and-mirror-l-artiste-modern-mirror-wall-art-design-prvw-vr~84538931 https://www.houzz.com/products/fab-glass-and-mirror-round-contemporary-mirror-for-wall-decoration-prvw-vr~84538950 https://www.houzz.com/products/fab-glass-and-mirror-the-mosaic-decorative-mosaic-mirror-handmade-prvw-vr~84538930

Bump for the teen room layout ;) There are not many threads on this topic. Maybe post sketch with room dimensions?

I see. I would still keep the decor on the left wall minimal or blank, but if you wish to look at something when seated in the chairs next to your bed, the piece of art that you have, hang it on the horizontal on that left wall. Continue by placing the smaller pieces currently above your bed behind the table lamps, but the piece of sculptural art you will put in their place must be more imposing than that artwork on the left wall. They should NOT be competing with each other. Just be sure that when you come into the room, the sculptural work is what stands out. My two cents worth.