Given the wooden window frames, consider roman shades or woven wood roll up shades. I would not add too much white since three of your walls, your baseboard and your crowne molding are already white, not to mention your bedframe (great bed by the way). Having said that, white night stands would be good, but suggest something other than white lamps, although white lamp shades would work. You mentioned Ikea. They have some great fabrics, bedcovers and lamps/lampshades. Ikea also has various window treatments, including roman type shades. They also sell a sliding panel system that is awesome if you see a color that works. It comes in various colors and would really add some life to the room. The panels slide on a rail system, allowing you to close and open them as desired. Agree it would be nice to pull the colors together with fabric that has both the green and the blue, either with the bedcover, pillows or window coverings. Also like the suggestion to try several small items over the bed (doesn't have to be pictures). The example picture shows three pictures of the same size. Two smaller items with one large in the middle also works well and might be a better fit with your square shaped bedframe. FYI, the lamps in the photo with the three pictures over the bed are really a bit small for that room. Notice in the picture of your bed, the lamps are much taller. Either tall lamps or lamps with a fairly large scale would be a good match to your bedframe. I would hold off on the ceiling light fixture until you have the bed in the room and have chosen your lamps, window treatments and other furniture. With all of these elements in the room, you will have an easier time chosing a ceiling fixture that matches the scale of the room and matches the style of your other furnishings. You have a great start going. Good luck with the finishing touches.

Melissa, when I said footboard, I meant this. It has a portion of the bed that extends beyond the mattress edge. You posted a bed that had something at the foot section of the bed. By platform, I mean a bed that has a hard area and only a mattress on it. Like this. It does not extend beyond the edge of the mattress, but does not have a box spring. It is also lower to the ground. The picture you posted was a high profile bed and box spring. It was not on a typical bed frame. A standard bed frame, used with box spring and mattress looks like this. Virtually invisible and does not extend out beyond the mattress/box spring set. That being said, I'd recommend you get a headboard that is not too big for your space. Neither in height or depth (distance from the wall). I would also not get a mattress frame that extends beyond the size of the mattress. Sorry to have not been clear before.

A picture of the existing bed would be helpful.

I added a canvas to your pic so you can see what a long thin one looks like. I think that canvas would be at least 5' long and not sure how I feel about the distribution on the wall..it looks a little like a smile face :). But I do think maybe 3 square ones would work. They would be smaller and I would center it on your space and under the windows. I did yellow and an orange color so you can see the difference. If you are looking for abstract art feel free to check out my profile. Also for my two cents I put shelves where people are not standing and bumping against :)