Definitely start with a rug. I don't know what your style is so can't make specific rug suggestion. But, I would take advantage of this neutral palette to choose a rug with a design and colors I love, then add pillows and accessories repeating those colors. Make sure the rug is large enough to be in scale with the sofa. The sofa has pretty hard lines, you might consider a round ottoman out of fabric. Above the sofa you could do artwork in graphic black and white, or color. Don't worry about everything matching. I am a believer that artwork is chosen because you love the piece. It should stand out in the room if you made the decision to invest in something. Check out local colleges the art department has several sales during the year of student art; especially around this time of year. Once you have the rug and ottoman add some chairs for additional seating. Enjoy and have fun.

As mentioned, possibly a darker pink or even a sage green for the rug. Here are a few ideas, including a mix of contemporary and traditional, which might work: [https://www.houzz.com.au/photos/cambridge-residence-traditional-living-room-boston-phvw-vp~118386[(https://www.houzz.com.au/photos/cambridge-residence-traditional-living-room-boston-phvw-vp~118386) [https://www.houzz.com.au/photos/coastal-vacation-home-beach-style-living-room-philadelphia-phvw-vp~316467[(https://www.houzz.com.au/photos/coastal-vacation-home-beach-style-living-room-philadelphia-phvw-vp~316467) [https://www.houzz.com.au/photos/every-day-chic-transitional-living-room-raleigh-phvw-vp~5996763[(https://www.houzz.com.au/photos/every-day-chic-transitional-living-room-raleigh-phvw-vp~5996763) [https://www.houzz.com.au/photos/breakers-beach-house-beach-style-bedroom-san-francisco-phvw-vp~355987[(https://www.houzz.com.au/photos/breakers-beach-house-beach-style-bedroom-san-francisco-phvw-vp~355987) [https://www.houzz.com.au/photos/master-bedroom-contemporary-bedroom-new-york-phvw-vp~66459[(https://www.houzz.com.au/photos/master-bedroom-contemporary-bedroom-new-york-phvw-vp~66459) [https://www.houzz.com.au/photos/country-house-drawing-room-traditional-living-room-london-phvw-vp~11440596[(https://www.houzz.com.au/photos/country-house-drawing-room-traditional-living-room-london-phvw-vp~11440596) [https://www.houzz.com.au/photos/model-home-living-room-transitional-living-room-santa-barbara-phvw-vp~530813[(https://www.houzz.com.au/photos/model-home-living-room-transitional-living-room-santa-barbara-phvw-vp~530813) [https://www.houzz.com.au/photos/victorian-living-room-victorian-living-room-richmond-phvw-vp~655185[(https://www.houzz.com.au/photos/victorian-living-room-victorian-living-room-richmond-phvw-vp~655185) [https://www.houzz.com.au/photos/traditional-living-room-victorian-living-room-philadelphia-phvw-vp~7015800[(https://www.houzz.com.au/photos/traditional-living-room-victorian-living-room-philadelphia-phvw-vp~7015800) I would try to buy from a store which will let you take the rug home, see if it works with your décor and return it if it doesn't look right.

Tan leather sofa look great with grey. I love my leather sofa, grandkids have been jumping over mine for years and still looks great, so easy to clean. I've had the fabric sofas and they always start looking shabby after a while. You can cover them, but what's the point, nice sofa and you have to cover it, no way. Just if you get leather, condition it every 6 mths, they will tell you if you buy one, only a matter of rubbing conditioner into it gently, easy

Lovely turquoise sofas, and your lounge has lots of natural light. What is the current wall colour? If you placed your sofas along both long walls, this would leave the window wall free for your view. Then you could have art on the walls behind sofas, or create a gallery wall of framed family photographs. A circular timber coffee table, or nest of tables, might work better in this scenario, with added benefit of no sharp corners for your little one.