Stephk1 there are so many choices you can make to enhance your room. Have you tried looking through Houzz photos for inspiration for colour and styling? That would be my first recommendation. Search on 'black leather couch' for instance and see how others have decorated. Here are a couple I found with a quick search:

https://www.houzz.com/photos/paddington-butterfly-house-contemporary-family-room-sydney-phvw-vp~1595279

https://www.houzz.com/photos/diy-bucktown-rehab-contemporary-living-room-chicago-phvw-vp~11780529

https://www.houzz.com/photos/funky-and-fun-living-room-transitional-living-room-san-francisco-phvw-vp~1729481

It sounds like artwork or throw pillows could add some color. Posting a photo would be helpful.

It's not letting me post photos for some reason. I have a couple that would be a lot of help but they won't post

Throw rugs can cosy up a space. Using warm white globes helps with the mood as well rather than a cool white.

Lux Throw in Lamb Wool Cream · More Info