Hi Orestis + 1 for everything everyone said above. You have shaded the banding so beautifully - you really are a natural at this.
I see your new TMB 6mm is paying off well in giving you some good detail to work with. What scope are you using at the moment?
I was observing Jupiter on Monday 18th around 9pm and the GRS was clearly visible; not quite in the middle of the planet. I love the swirly grey/blue cloud bands on this side too, its so much more interesting to me. Here is a link that I use to track down the GRS.
http://www.skyandtelescope.com/skyte.../91731334.html