Vicki, I think a roman shade would look very nice! You could install it inside or you could hang it just below the crown molding on the cabinets. Depending on how much fabric you have and how much you want to spend, you could also make a mock roman shade that doesn't function. On this job I have mock roman shades inside the window in one area and then on the outside due to window depth limitations on another area.

For the sliders, I'd look into a remote controlled roll down shade mounted outside above the doors. You can get them in different degrees of opaqueness, to control the light, but they will not give full privacy at night unless you get opaque, which won't work in the daytime unless you want black out. Most people have some kinds of lights outside their doors, so if it's lit outside there is no 'black hole' effect for uncovered windows. On the corner windows, I'd want bottom up shades so they could be partially covering the bottom part of the windows for privacy (the only part anyone could see in), yet you can still see out over the top and get the light. They also make vertical cellular shades that stack to the side and pretty much disappear. Outdoor mounted roller shade:

Hard to understand why a northeastern exposure would get a lot of sun. Perhaps a small amount in the early morning in midsummer, but it has to be out of the sun after that. If it's more eastern, than northern, a little more morning sun. My solution would be to plant small shade trees not to far from those windows.

I love the dressers where they are! But to your question: Dark wood slat blinds would be classic but if you want curtains, your room is so traditional there's nothing wrong with having one very wide panel that hangs to the far side of each window only. If it were me I'd do short curtains, just a bit down past the sill -- again because I think it more fits the tradition of the room. But some people go beserk if curtains don't touch the floor. Personally I would do a dark deep color, or something in a rich dark pattern of olives, rust, caramel, burgundy, chocolate... velvet Your room looks like a great place to sleep.