I don't mean to sound like a jerk, you should just take this as friendly advice:
All three wallpapers have been made with a method which in my opinion, has been copied and abused over and over again by various artists. Ubuntu is one of the many distributions which have "adopted" this style to their official wallpapers. Sabayon on the other hand, has lots going for it in terms of originality in both colour and style.
Having said that, in terms of colour, looking at wallies #2 and #3 makes me think "Ubuntu", apart from the obvious Apple elements in there.
Nevertheless, copying can prove to be very good practice. Learning how to get the software tools to do what you want can be established by trial & error, and then some. So my advice to you is, keep it up until you develop a more personal style which defines you, and no one else.