Here is a possible coffee table;)

Some pillows maybe?

I love all of Margo's suggestions. It is hard to envision the room, it looks almost as if the sofa is already too big for the space. If you have the room, move the ottoman next to the sofa and use it for additional seating. Get an oval coffee table, and accent chair for the other side and some additional pillows. I think the color of the sofa might be too warm for the navy combination. I think Margo's colors are perfect.

Navy is a fine idea, and won't make the room seem heavy, if you break up the colour w a pillow, throw, or use a navy print on the chair itself. Lazyboy has a large selection that might do well w your sofa.

let's not forget lighting. This could go in the corner next to the sofa ;)

LOVE the chair and the colors, too!!!

a little something for the coffee table and a bit of ambience;)

Well you have a great room to start with and the couches are a really good anchor for choosing your color theme for the room as you move forward.I think before you shop for any additional furniture, it is really important to have a color plan. That way of you want to add anything to your room from extra chairs to accent colors to rug or even candles, with a plan it is easier and a lot more fun! ! I created an app called Color911. ( find out more about it at Color911.com) You can create your own palette of colors OR take/find a photo of something that inspires you and pull the colors from it.. or check out the color themes. Within the app are many pre-made color themes that are colors that all work beautifully together. You can choose any number of colors within a theme and use the colors for everything from wall color to accent colors to colors to paint your furniture.. you name it. I have been an award winning color consultant and have authored two best selling books on color. I created the color themes myself. If you find a theme that inspires you it can be great fun to shop for anything when you have the theme to use as your guide. Each of the themes are different. I have attached a theme for you which is just a screen shot from the app that might work for you. There are many in the Color911 that match your couch, this is just one I thought you might like.I hope it inspires you!

Or even look at the posted pics and draw a color from that for your chair. Or, I tend to do neutral material chairs so that when my style changes I'm not stuck w ill fitted chairs. What about cream? Then jazz up and hide the couch w blanket, pillows, get a rug. Eliminate the ottoman and change out to a table and get a 3 or 5 piece fun grouping to set on it.