Geez, your ceilings are only 9' high. Standard for new construction these days. You have purchased all your artwork in brown earth tones which doesn't do anything to enhance your furnishing selections. Also the scale is too small for most items.

I would encourage you to place a chandelier over your dining table and move the fan to the center of the living room area.

http://www.pier1.com/Fern-Art/2615710,default,pd.html?cgid=art-cool-colors#icid=cat_home_decor-subcat_mirrors_wall_decor-subcat_wall_art-banner_cool_colors&start=1

I agree with Beverly, no fan over table. Get a chandelier

Here is rectangular one

I would get a mirror over buffet with the reflection of that beautiful art and the smaller mirror in center is not distracting.

Yes, I agree that scale is a big player in your current space. Here are a few suggestions to help:

1) You need larger pictures on the wall. This is a great way to add pops of color too.

2) Your furniture is large and overstuffed. Consider getting furniture pieces that are apartment sized or have smaller legs so you can see more of the room.

3) Yes, a chandelier or even a pendant light with a drum shade would bring the light down to the table level and fill your space vertically. Make sure you have 3 ypes of lighting- over head/general light, task light such as floor and reading lamps and accent lights such as table and specialty lights that add a sparkle to the room.

Have a fun time with your lovely space. Enjoy!!!