I think a modern planter, such as Room & Board’s Case Study planter on stand would look better, other options at Rejuvenation.com & Design Within Reach. Less expensive opt available elsewhere ( e.g., Target ). I can’t see using lanterns in that corner .

I would go with black but they need to be much larger.

Black & larger ones.

Where can I find those modern black lanterns in the second photo above?

Black finish would best suit your space.