It looks very nice as it is. What part do you want to change? I think the only thing I would do is add some window treatments.

I agree with Mocreidhi except I don't think the rugs work for you. I would think the medium dark wood walls and ceiling make for a warm cozy environment in winter but seem a little dark and warm in the spring and summer. I would change the rugs and find a fabric in very bright cheery colors (picking up some of the orange in the chair) Yellow, orange ,lime green with a little touch of brown. A bright cotton print tropical design comes to mind. I would make simple roman shades for each window, a table cloth(with a square over cloth of the dominate color) and large comfort pillows for the sofa all out of the same fabric. This will not only brighten up the drab space but also establish a theme. Put down plain rugs in the dominate color of the fabric.

jands127 We haven't heard from you. I love your rugs. What don't you like when you walk in? I have added a mock up with some window treatments that can add a little softness.

Hey There:

Do I see it right that you don't have any window
coverings for your sunroom yet? Please give it as much attention as you give to
the rest of your design.

Window coverings are so important for your sunroom to keep it
cooler during summer, improve insulation during winter and of course give you
the needed privacy...

Take a look at these ideas...

Window Treatments for Sunrooms and 4 Season Rooms · More Info