Bring the window down to meet the cupboard. Really lefty47 was right about not drawing attention to it. It is a source of light ,,, so no need to clutter it up. But if you took the colour out and painted the top of the cupbard to match the wall it ceases to draw attention to itself. Just because it is a horizontal space does not meant it needs something put on it. Note- With the cupboard being white, it also draws attention to itself … perhaps take that to the wall colour too and lift the pendant a smidge. So your pendant is the feature there. The cupboard … do yo need it? One way to remove what you are calling dead space is to get rid of the cupboard.

Wow, that was awesome Mark, thanks for that and everyone else. I thought about the desk facing the other way actually, to avoid feeling enclosed I do have really great views there so I thought about a small couch and maybe a bookshelf on the back, but having the dining table in front is probably not the best either.... complicated :( Here are a couple more pics, today was a beautiful day so I managed to get more of the views

You might paint the walls a bold color you really love, but I would recommend staying away from wallpaper as it is costly and too difficult to change. I agree with another poster that wider trim around the doors would help, and I would suggest that you paint all the trim white and add crown molding and a mop-board along the floor-wall junctures. I love the wood-tone door and would keep it as an accent piece and for contrast. You might add large, framed mirrors to the walls to reflect light and perhaps add a console table with a fairly large lamp. An interesting print area rug also can add pizzazz to this space. If you can use the bold wall color as an accent throughout the house, it will help to tie the entire color scheme together and give your home a unified look. In the offset hallway shown in Photos Two, Three, and Four, I would suggest you place a desk and chair and/or perhaps some bookcases and curio cabinets to make an interesting entrance way that can double as a study or home office. As an alternative, you could place a narrow dining table with leaves that fold down to allow easy traffic through the hallway. Above the table you could display some framed mirrors and, in matching frames, family photos that can serve as conversation starters. When you entertain, the fold-down dining table could be pulled out and/or moved to another room to accommodate your guests.

Wow! What an incredible view you have! I think you first need to frame it out. I would suggest changing out the carpet with hardwood floors with a worn or weathered look. Definitely get rid of the plastic and replace with white base moulding. Next I would paint the walls a color in the pale grey or grey/blue family. Next, I would suggest some crisp white sheers to frame each window. In the pictures, it looks like the Windows on the right are two windows wide. If so, I would also place panels in the middle of those 2 windows to continue framing the view. These are for decorative purposes only and not intended to distract from the view. It looks like there is a big space between two of the windows. I would locate a large architectural piece to place on that wall to add some interest. Remove all the small items from the window ledges. Finally, I would love a round table in that space. Good luck with your reno!