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The grey selections do not complement the beige selections in the room IMO. Love the color of the grass cloth wall and that element can work with the grey sofa, but the leather ottomans and coffee table just don't work together because their hue is so very yellow.

The shelving is fine. I would purchase a larger wall mounted cabinet to hold the TV as your cabinet for the TV is way too small. Can you move the sofa closer to the TV wall? it seems a bit far away.

It's probably best to combine both the gray and beige in a rug together. There are a number of on line sites that are great for purchasing rugs. Just be careful about competitive pricing.

You could do a thick shag or patterned rug. Based on the level of the furnishings you have already purchased, a 9x12 will rug between $400 and less than $1000 for a very nice rug depending on the fiber of the rug.