I love beds built into nooks and closed off by curtains, but presuming that's not on your mind, how about lining the walls with books and putting in a chaise? You've even got room for a double chaise.

Wow. What a cool master bedroom option. Without knowing the actual dimensions of the space, it looks large enough for almost anything. It totally depends on your interests.

An exercise space or yoga area. You could add a bookcase on one wall with two comfy reading chairs opposite. Center two chairs and a small table with a master room coffee maker area or a private wine/whiskey bar area. A sewing/knitting/needlework niche. Maybe add an electric fireplace and a lounge couch.

I’d go with relaxing and enjoyable rather than office, work,computer, tv, etc.

closet dressing area?

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Two club chairs with ottomans.

What are those two tiny doors?

Can you get another elephant? I might put one on each wall and then keep running with your exotic animal theme...do something fun and a.bit wild, or a lot wild...

add a desk and some bookcases if you have a need for an office.