you dont need window treatments. remove the valence, and the window is as big as it will get. hanging curtains in your tight spaces will actually make less sense. if you really want decor on them yes roman shades.

In the meantime, remove your valances. You'll gain a lot of light in the daytime with them removed.

If you decide on roman shades I would treat all the windows the same. Drapery panels would crowd both your TV stand and the corner chair anyway.

This space is open to the kitchen? How are you dealing with window treatments in the kitchen? If you paint the window trim are you prepared to paint the baseboards too?

outside mount.. like above

I agree with downtheriver. The valences should definitely go. Do you need drapes for privacy at night when someone could clearly see in?

The windows next to the fireplace could have panels but they would need to stack to the side away from the fireplace. The single panel on each window would need to be 2 times as wide as the window. That will cover up some of your windows so you must decide if it's worth it.

Here's what roman shades could look like for your windows. I like the looks of inside mount which allows the whole frame to show whether open or closed.

Outside mount drapes (hung in front of the sheet rock instead of the window) can make a room feel wider and windows feel larger. They also offer the option of closing them at night for privacy.

It all depends on the look you like. I agree with those above that roman shades are nice as well, as long as they're hung above the window, not blocking any of the window.

Many more window treatment ideas on this Houzz site:

Before and After · More Info

your windows are not as tall as above, it will not be the same look.

here are outside mount

You can use rods and just have the panels stacked on the outside. It won't block your window but will elongate them and make the windows appear larger, like Transforming Rooms showed you in the photo.

Nothing wrong with mixing drapes or stationary panels and romans - just in the same fabric. Just hang the drapes as per the illustration below and keep the romans high or maybe even with the top of the drapes.

Falmouth Residence · More Info

Enviable Designs Inc. · More Info

Take your valances down and live with the bare windows for a few days. It may help you to decide.