SOME SKETCH "BORING TIME"

after I read so much about UDP (User Datagram Protocol) and i get confused and boring with my program.. so, i decide to sketch some, i know its not a good sketch.. and i tried from some sample sketch, and i was trying to sketch it without any help, only pic in front of me, my pencil, my paper, and my pen.. ya, as you know i want to learn how to drawing a sketch.. i have learned about it when i was in junior high school, coz of my friends around me loves drawing so much.. so, i learned.. and now, i want to learn about it again.. even i know im not good, but i'll take some practice for it.. maybe you can give me some advice to be a better illustrator??