That's really a nice room. So much to love about it, including the windows we can't see on the other walls. I agree with colourhappy's point about negative space, and also with those who feel for other reasons that nothing is needed in the high spaces. The first and third photos posted by Rebeccamom123 illustrate keeping attention down in the levels people occupy. But those rooms benefit from a unified upper line defined by the architecture that you currently don't have. Rebeccamom123's middle photo shows wonderfully that that isn't the only way to a beautiful space, but this design is far more complex and required some talent. And I think yours also requires a little talent and training to make it look good. That TV placement may be necessary, but to me it creates a really significant visual problem. Since you're adding a mantle, etc., perhaps consider hiring a good designer to pull it all together? For instance, just because the TV support and lines come out at that point doesn't mean the TV itself couldn't be moved down (and sideways?) to a better position, adding architectural detail to disguise as needed. (Btw, strictly in the interest of feedback, one of those corner side walls looks big enough for your TV, or next size down, and I'd almost certainly have put it there. If it needs to be on the end wall to be seen from the dining and/or kitchen areas, and a TV in the kitchen's out of the question, of course that's the place.)

I need help with what to add to my mantle that will go with my bull! I have a few things to the left but I don’t care for it. Any suggestions?

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It does look a bit bare with just the clock, but that's an easy fix! Adding in some candle sticks on one side, maybe a small framed artwork or two, and even a plant would really help add depth and interest. You can overlap things of different sizes as well. Just make sure to leave a bit of empty space in there if you're setting various things on the ledge, as it may start feeling overcrowded. Here's an example of layering done really well. See how it feels even, but it's got lots of interest? That's the idea!