How about some elegant black iron scroll work? There are scads of varieties and they are often the perfect solution for a wall that needs that certain "something". (The photos are from my home.) I recommend choosing art that a) reflects your interests and b) makes you happy every time you see it. You said you can't your hang travel visas and martinis, but why not? You could frame your travel visas and arrange them under a large matte. For the martinis, you could either buy a painting or print of them or literally frame some martini classes in a shadow box. You might also consider vintage travel posters from places you love or that you've already been to. Your home is very nice!

I like them, keep them.

You could remove those “frames.” Get a colorful or geometric outdoor rug. Try a fun pendant light, correctly sized! Different wall sconce, if any. Better landscaping. The above pictures are just ideas, to show you there are more interesting options out there than the ordinary...

Real or faux plants