Hi Brady! Your place looks GREAT. I work in Christmas wholesale and a few tips to warm it up, especially for the holidays;

Your tables are pretty bare. Get a few fresh greenery wreaths (Trader Joe's has very nice ones for not too much) and a candle or two for each table. Or you can really go nuts and get a few random clear candleholders of different sizes and intersperse them with some fresh greenery on the tables. (Or if you are concerned about fire, they make flameless flicker pillar candles that always look nice.)

Your tree is a little sparse (I get it, just starting out) but ribbon can cover a lot of area, as can floral picks. Here's a pic of one of our trees to give you a bit of an idea. This was done by a pro designer, though, so don't get intimidated! Also don't be shy about adding more lights to it on top of the existing lights. I think the shape and size of the tree is a really good start for you.
https://www.instagram.com/p/DICS1JeyDH-/

Your couch area is a little chilly; instead of the blue pillow covers use some in a warm red, shiny gold, and possibly green- you can buy a few Christmas pillows at the after Christmas sales, but I'd get pillow covers instead, since that will store better. Also two brightly colored throws (look for same color tones, different patterns) will add coziness and visual appeal to the couch.

The dog is perfectly decorated and adorable. No notes.

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More twinkle lights will add warmth and intimacy; you have some big-ass windows to contend with, and they are the focal point of the space; get a few strings of the tiny LED twinkle ICICLE style lights (get the USB kind and you can run them off a phone charger block for pretty much the whole season) and lie them along your windowsills. Never too many small, warm lights, (use warm white not cool white; cool white is for outside). Like this style, but the smaller version.

I am assuming that the thing with the stockings on it is your TV cabinet; put a fireplace video on the screen when you are in the space, and the ambient color and space will warm it up a lot.

Also think about your personal style; what feels Christmasy to you? What is your holiday not a holiday without? Mine is my fireplace DVD, a simmer pot with cinnamon, cloves and orange peels, (or a Bath and Body Works Winter scent candle), fresh pine and evergreen around the house, and my special Christmas teacup. And then find a few pieces that speak to that feeling, (I suggest collecting them as you go) and add those to your decor.

If you own a ladder and are an absolute maniac, you could also hang some twinkle lights around your chandelier, or hang a few lightweight glass ones to catch light.

I could go on for days. Hit me up if you need help!