This is very well exposed and executed. But the composition is too static to hold my attention for long. There's no bottom to the vase - no resting place - and that's a bit awkward looking. It tends to change the thing from a photograph to a "graphic" element. There are no contrasts aside from the small dead leaf. And the b/g looks like a piece of paper instead of a solid surface. That may sounds like a lot of objections, but they are easily fixed. For instance, suppose the vase was moved to the left? Or, suppose the background was more contrasty to the vase? Or suppose the vase was resting on a red platform? Any of those kinds of changes would give the photograph more stopping power. As a centered composition - which is fine too - I would then expect the subject, in this case the plant, to be something spectacular, not something mundane. Your idea of capitalizing on simplicity is a good one.