Why not watermark? I do, for a few reasons:
1. It deters many people from stealing the image (especially clients who don’t have knowledge in PS, or inexperienced photographers who might want it to beef up their own portfolio)
2. It helps advertise my name a little bit. Images get shared (mostly on FB) and my name floating around is good for me.
I like the bulging wall for that image. It’s more interesting. Not applicable in every image though.