Are you saying light comes from the north until late in the day, or are you saying there is a window facing north and a window facing west.? The reason I ask is that light that enters from a north-facing window is bluer and lacks intensity. Subtle color is washed out to gray. The Inchyra Blue is very dark, looking more charcoal with a green tone to me. I would choose the Cooks Blue. Here is a comparison I put together of those two colors with some blues from your rug.While the actual colors may be off due to how color can vary from monitor to monitor Cooks Blue is brighter and won't fade as much in northern light. Also, having a brighter blue on the walls should bring out the blue in your rug. The only way to know how it looks in your room is to buy a sample and paint a board as you did for other colors. Keep in mind that the color temperature of light bulbs you use will also affect the colors of your walls and furnishings. Color Temperature is expressed as Kelvin but is not a measure of heat. Warm-white bulbs have a color temp of 2700K which is kind to skin tones but gives a yellow light. Daylight bulbs have color temperature of 5000K to 6500K, but are harsh to skin tones and emit a blue-white light. Both CFL and LED bulbs come in various color temperatures. I recommend you choose bulbs with color temperature between 3500K and 4500K for a more neutral result. HERE is a photo of how different K-value lighting affects the appearance of color. You might have to visit a lighting store or light bulb specialty store to find neutral white bulbs. As to ceiling colors, people seldom look up. Unless your light fixtures are dramatic or the ceiling color is distinct I doubt anyone will notice if two adjacent rooms have different ceiling colors as long as there is a Framed Passageway between them.

There is not any wainscoting below the chair rail and to be honest, I'm not sure what the color on the walls is currently. It's quite dark and dreary and was painted by previous homeowners. I actually matched the the trim paint and painted below the chair rail a few months ago in an effort just to brighten the space up until we decided what we wanted to do with the room. We do have a formal living room on the other side of the foyer but there is not another room that is off of the dining room. There is the hallway and kitchen on other side and that opens to the breakfast nook and family room. The wall color throughout our entire house is beige. Again, I don't know the exact color as it's how it was when we bought the house. This room does get a lot of natural daylight in the morning but the afternoon sun hits the back of our house and the dining room doesn't receive any of the sun then. However, we do live in the South and get a lot of sunny, clear days. We did look at quite a few reds last night and trying to determine one that would look good. I love blue and was really trying to lean that way but I couldn't find one that I liked with the rug. Every one I looked at was either too bright or too subdued and couldn't seem to find a middle ground. Someone had mentioned BM Pomegranate which seems like it may be a good fit for the room. We looked at Rustic Red and Sun-dried tomato by SW and they seemed to blend in well.

It looks like your chairs are very neutral. What are the colors in the rest of the rooms? What about window treatments? I would suggest finding a rug or drapes that I love and then choosing a paint color in one of the lightest shades contained therein, since the room is small.

Do all the furniture pieces and carpet stay in the room? If so, take a look at Bittersweet Stem by Sherwin Williams. What don't you like about the colors you sampled?