Be careful not to go overboard using different neutrals. Some neutrals are warm toned, some are cool toned. You can combine warm and cool in a space but it is hard to pull off. If you aren’t confident in your decorating skills, pick one neutral tone and stick with it. Then add interest with accent colors. A good place to start is to find a properly sized fabulous rug with colors that work with your floors and walls. Then build the rest of your choices from the rug style and colors.

1. sideboard is too large for the walkway. Move it under the t v. Choose a long sofa console to go behind the sofa. On the now empty walkway wall, you can design for hanging coats, etc. https://www.housebeautiful.com/shopping/home-accessories/g25589411/decorative-wall-hooks/ 2. You could turn the sectional and wall hang the t v on the long entry wall using the t v console you have, With the sectional turned, you would have room for an extra chair by the front door. Again teeny photo...I lik this chair with your sectional, too. https://www.wayfair.com/keyword.php?keyword=front+entrance+chair Found ready-made drapery panels which match the chair. https://jllhomestore.com/products/blue-grey-curtains-grey-white-curtains-light-blue-medallion-curtains-custom-curtain-panels-ogee-print-curtain-panels-linen-blue-white-drape

If this is enough space, you can just buy this (if you are willing to move the couch) https://www.wayfair.com/Latitude-Run®--57.5-H-x-29.9-W-Cube-Bookcase-X122385351-L38-K~W011274240.html?refid=GX589548145854-W011274240_568172808&device=c&ptid=1969289299657&network=g&targetid=pla-1969289299657&channel=GooglePLA&ireid=239105833&fdid=1817&PiID%5B%5D=568172808&gclid=Cj0KCQjw9MCnBhCYARIsAB1WQVW_1TRni2O66Rq0qNn8na6bil80XmB6Rni9uHwwY_lyCGF0eopM1b8aAoMREALw_wcB or similar https://www.homedepot.com/pep/Furinno-White-11-Cube-Reversible-Open-Shelf-Bookcase-11107WH/312900605?source=shoppingads&locale=en-US&pla&mtc=SHOPPING-BF-HDH-GGL-D59H-059_034_INT_FURN-NA-NA-NA-PMAX-NA-NA-NA-NA-NBR-NA-NA-NA-%7C059_034_008_HOME_OFFICE_FURNITURE%7C_PMAX_phase_2&cm_mmc=SHOPPING-BF-HDH-GGL-D59H-059_034_INT_FURN-NA-NA-NA-PMAX-NA-NA-NA-NA-NBR-NA-NA-NA-%7C059_034_008_HOME_OFFICE_FURNITURE%7C_PMAX_phase_2-71700000111492702--&gclid=Cj0KCQjw9MCnBhCYARIsAB1WQVVGLXyneHS12A95nIF2SEoXpF-bMy9DlP_NHAq9t-v5lAfV-Rd1_fYaAk9ZEALw_wcB&gclsrc=aw.ds between the bookcase and the bed, put a full length mirror put a small table and lamp in front of the mirror Put art on the wall over the "daybed"

Keep it simple. A picture that is horizontal versus vertical will be better for the mantle. One print could be sufficient but you could add a small bit of greenery and a candle. I also like the pick with just a plant on the hearth and nothing on mantle.