I agree with Judy M. And at minimum, I prefer that the front feet of both sofas be on the rug. But there are many different configurations that work.

Your picture display looks lovely with your sofa and will look better if you bring it down because it's a bit too high above the sofa ( unless you plan to keep adding to the picture collection below from where your pictures are hung now) and in that case just keep in mind that multiple frames look best when arranged in a diamond, rectangular or square shape and spaced relatively tight, like 1-2 inches apart. A looser grouping can work for a more casual display.

i really would wait until you do the floor and walls.

Awesome Houzzers, thanks for the responses. Overwhelming consensus seems to be that they dont work (at least without distressing the table, which sounds complicated). I am now thinking maybe I move the sofa upstairs and buy it a new coffee table along the lines suggested by maureen and lee lee (thanks). In the living room, I could then leave the oak coffee table, together with the armchair that works with it (it has a similar oak frame and is covered in natural linen). Then I can find a new sofa to match the coffee table. Any tips? The coffee table is 1200 x 1200mm. You guys seem to think that is ginormous - how big would the sofa need to be to look proportional? I am thinking of an L shaped sectional. Possibly also in some kind of natural linen fabric? The living room is big (5m x 8m?). Thanks again - much appreciated!