Art is subjective - look for what speaks to you. And, I'd hang it lower than what you have now. Since your palette is neutral, your art could be full of color.

Hang lower and closer together. Good Luck!

I bought my most recent painting at an art show organized by a local group of artists. I've also bought art in galleries, at street fairs, and from "starving artist" type exhibits. I happen to like old prints as well, so I've got some pieces from stores specialising in old maps and prints. There are on-line sources as well, but personally, I want to see a piece in real life before deciding.