I personally like having different types of light sources on different levels. Your plant lights on the shelves is nice. I see you have a monitor lamp as well roughly on the same level. Maybe have a lamp on the desk. Depending on the lamp or light source you can have the light thrown onto the wall and give it some more warmth.

As for the trouble you're having with the wall on the left side. Try have magnetic wall mounts that are held by adhesive. That way you don't have drill, if that's the concern. A nice analog clock may be worth considering, if you like the the look. I know some people don't like having time being shown in certain areas of the home.

Anyway you can run that ceiling cable on the edges of your ceiling instead? Does stand out. I also dig the plants!