Betsy is right -- there are so many colours you can add to taupe and navy blue that the mind spins. So look for art you love, in a large size (original or print, it really doesn't matter as long as you love it and the colours say to you, "that could work with what I've got!").* Hang that above your sofa, and then pick colours from it to replace a couple of throw pillows, and add a couple of vases, bits and pieces. You have the basics absolutely right.

* The idea of looking for a work that matches your colour scheme is anathema to many art purists, but where is it written that everyone has to be an art purist? I'm not saying look for a navy & ivory painting. Just something that says, "I would like to be in your living room, and you would love to look at me every day."

You have a great start! LOVE that blue chair. Definitely agree with adding some art above the couch. Remember not to hang it too high! I found some cool art at Hobby Lobby - LOTS of different prints, designs, styles and sizes (including some really big pieces that would work in your space). Reasonable prices, too! You could also benefit from an accent rug under your coffee table. I would find the art first. Find a piece of art that you love in the size you need, then find the rug. There are a million rugs; there are far fewer art pieces that will 'speak' to you. https://www.hobbylobby.com/Home-Decor-Frames/Canvas/c/dc-Canvas

Thank you so much for all the wonderful ideas. I do think everyone is right about the art. I did find a really nice painting in the new Home Depot Magazine (believe it or not) but not correct size .. it only came in square. I did go to Hobby Lobby (twice) and found lots of items for my kitchen ! I love my blue chair which was the first thing I bought before anything else.

You have a lovely room. I would look for a rug first, then art and accessories.

If you really want character, add good trim, like baseboard, wainscot, crown and window trim. If a room has good architecture, in proportion, it looks great even when empty!

I'd add crown molding and then do blow ups of a couple of favorite portraits - a kid or pet would work - to hang behind the sofa. Add some accessories in metal for a bit of bling. If that's too casual for you, try a grouping of metal mirrors.

You could try blue, gold, white, yellow, coral, grey, etc. The color combinations are endless. The easiest way is to find a piece of art you love and start with that then add accessories.

I thought most of the designers recommend rug first. Art can be replaced a lot easier than rugs when you get tired of it.

That depends how much you love your art and how much you love your rug. I think it's a personal decision. If I want a particular piece of art in my room, I'll gladly go without a rug to accommodate it. Of course, some rugs are indeed art, and then it could work the other way around.