The water drops add interest, Kostas. I think the composition might be stronger if the dominant leaf (the only green one as well as the largest) were not centered. A diffuser to soften the light (a cloud or some light fabric) might also be worth trying as long as you could retain the dark BG.
Hi Kostas. You captured a nice mix of colors and shapes and the water drops are a plus. Mitch has offered a couple good suggestions for you to consider. I would also suggest that the comp would be stronger if the edges of the frame were cleaner (i.e., if there were fewer clipped leaves around the edges). Given the way the leaves are positioned, this may be difficult to accomplish without physically moving some of the leaves.