Hey Kostas,
I think you did very well here! I like the simplicity and the water drops are very nice with an excellent color in the BG. I do think you can smooth out the RH side a bit more....but just a minor tweak. I was going to suggest more room on the left....but find I like the balance of this as you have presented. Nicely done!
I also like the balance and the crop, Kostas. Beautiful exposure and very nice details in the water drops. If that BG weren't so beautiful it might be an ordinary image but the colors along with a perfect choice of DOF really makes this lovely to look at. Well done!
While I like the image I have to question the technique employed - why the ISO 800 which then mandated the use of a denoising tool? What kept you from using a longer shutter speed on a static subject like the one shown?