For me, your background is too grey and muted, although your vase has contrast. I wonder if cropping it in more from the left hand side, making the object off-centered, would help?
horizon is a bit off
definition of the art on the vase is to blown out to capture what the object was
the vase seems to be reflecting the background which gives a mottled apperance
Reasonable pic of a vase, I dislike the noise in the background and the loss of detail on the flower
High contrast is achieved by combining red/cyan OR (deep)blue/yellow OR green/magenta OR for the ultimate high contrast, black/white. Yours is a mix of black with several mid order grays and very little white.