You have a great opportunity here. I do not recommend placing a tv over a fireplace. Yes, we see it often, but it is not practical for two reasons: 1, the tv has to be placed too high and 2, it is hard on the eyes to be looking at the fireplace light and the tv What I would do is to remove the plaster and re-expose the brick. You could paint it an interesting color or resurface it. Then, I would add a unique mantle.If you have the funds, ideally the threshold should be removed (more contemporary) or resurfaced (more traditional style) The wood store could be a book shelf or display shelf. In the right corner, I would place a comfortable reading chair. The TV I would place on a different wall. Without seeing the entire room, I am not sure where.

Have you thought about getting slipcovers made? If you wanted to go with a cottage look white or off white would look good with your rustic fireplace. Don't be afraid of the white, slipcovers that are made well will last a long time, and can be washed even bleached. I have had mine for probably 9 years now. Love that you can wash them. I would skirt the bottom of the slipcovers. I think it would really transform them. You could bring in some blue accents with pillows, etc. Some pictures on your wall with some ocean blues would look nice with some rustic touches like antlers, shells etc.

Is that a window in center above the hearth? Is rock just a facade? Looks like you have a mixture of furniture styles. Windows look more of the modern style while drapes are traditional. I would say pick one style and go with that. From the windows I'd be leaning modern/ contemporary. If the rock is just stuck on wall take it off. Replace with horizontal wood planks stained same as your door casings. No mantle. If that is a window I would either have a stained glass insert made (again using modern lines) or do a faux stain glass painting treatment to add some visual interest.

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!