these are my options

If your formal living room is just for admiring and not for sitting, any of those would work, but none of those look very comfortable. You already have two leggy chairs and the dining chairs nearby, so I would want a sofa the doesn't have legs that show. Sofa #1 will be too large, #2 will only seat two, and the lines of the back of #3 are much like your current sofa. Maybe see about re-upholstering your current sofa in a better color/fabric.