It all needs softening and layering imo @Interiordesign. To do this you need to add pattern, texture and stuff you love.
I'd start with a huge Persian style or kilim rug - we've found some amazing antique rugs on eBay, but you can find a similar look for much less £££ at many online stores (eg, rugvista) or somewhere like Dunelm. As previous posters have said, the rug should go at least under the front feet of your sofa to look right - don't skimp on the size! The ones you posted are a bit bland for my tastes and I think you need a more saturated injection of colour - but if you love those tones and can build a scheme around them, that's what matters!
Then - assuming you own and don't rent - I'd pick out a colour from the rug and paint all the walls in it. I'm a huge fan of colour-drenching (painting walls, ceiling, woodwork the same colour) as I believe it makes a space feel larger, but it's not for everyone.
Curtains make windows look larger if you hang them on a pole wider than the window and a fair bit higher too. It's another way to introduce pattern and colour to warm/cosy the space up.
Cushions need to be a mix of colours, patterns, textures and sizes - buy these in a mix of fabrics/designs you love...which is good advice for everything - don't settle for something because it's on trend or 'it will do', but buy with your heart! As someone once said - if you buy what you love, however random, it will somehow all work together.
Finding a piece of art that speaks to you or makes you smile is another good starting point.
Good interiors don't happen over night - we've been collecting stuff for years and don't follow trends, instead opting for an eclectic, maximalist, country house vibe. Although we've moved lots of times and recently downsized considerably, we have an amazing (imo 😉) array of decorative items (mostly eBay, fleamarket or auction finds), art and books, as well as designer fabric remnants (a passion of mine) to dip into so I can usually 'shop my home' when a room needs tweaking...but it's taken years to get to this stage.