Hi Kostas,Interesting study! More DOF would of helped but I realize you need the speed without a tripod.
I would take out the small bright area in the upper left.
That seems to be a lesson we all need to learn Kostas, about buying cheap tripods. Too bad.
If mine, I might crop a bit from top and give a slight cw rotation to level it up a bit. I like the two identical shadows on either side of drop because they look like they are holding drop up.