Really good sketches @paolobeneforti! I particularly like the second last one! That is awsome!
If it interests you at all I am having my own drawing contest with a 25 SBD prize pool based around learning and improving drawing skills. It would be good to have an experienced artist take part and lend their support by entering and also voting for a winner as well as giving advice and constructive criticism to entrants. If this is something that interests you then please visit @tonyr and click on the 'Learn To Draw With friends!' post!
Thanks again for sharing your sketches!
Hope your day is going well!
tx! :)