Yellow or orange is a great counterpoint for cushions for the sofa and maybe a rug. Curtains are more expensive to replace so it may be best to keep them neutral. There's a cute modern style rug from habitat with a grey & yellow pattern. Take a swatch of your check and see how well it matches.

Hello Kev22185, Why not consider the cushions and a throw perhaps... Once you have decided on a colour go ahead and find some cushions that compliment. In this way you bring the scheme together.. For that colour of sofa Teal is a fantastic wall colour for tan or mid to dark brown leather.. ...neither of them are a chesterfield but you get the idea... Bolder darker colours can look opulent and dramatic and depending on what you put with them doesn't have to say "Masculine" if you want something softer.. Have a think about lighting and what else the room has in it that might dictate the overall scheme... It's a living room so you want it to be relaxing and functional for quite times at home and also for gatherings and entertaining.. : )) Here's a dark inky colour... with a chesterfield...

Thank you all for voting! We went with a charcoal velvet sofa in the end, very squishy and comfortable - great for the library! Green velvet would have also looked great but as ever, budgets aren’t unlimited so we went with something that would hopefully fit in if the decor changed in the future!

So, I've thought about it :-) Looked at your inspiration photos and came up with this. Be honest about what you like or don't like. The rug is from Dunelm https://www.dunelm.com/product/think-royal-nomadic-5746-grey-and-blue-rug-1000138143#Colour%20Group=Grey Cushion covers: HM Home (cheap and cheerful) Nest of tables and knitted pouffe: Wayfair And I thought that a solid green fabric could be nice for the footstool.