I think so, almost invisible against wall. If uncomfortabke w/ color, how about b&w nature prints?

While the color goes with your tile and walls, it doesn't offer any contrast to add interest. Even if you want to stay with a neutral monochromatic color scheme you need a varity of darks and lights.
Find artwork that speaks to you. You decor is neutral enough to let almost any color artwork shine. Old sepia sketches or bold abstracts can work.

Also depends on what you put with those. They could be a good back drop for decor on a table or consle.

They don't stand out at all against the surrounding colors. Art is meant to be seen. Choose something you really love, no matter how colorful, even if everything else is neutral. I would choose one very large painting instead of the trendy triptych style.

Thank You everyone for your comments!