As you wish.
Ok, maybe this will be a lil' rough, but, i think that you must know this...
First of all, take your time when drawing. Never speed up things, cuz' the only thing that matters when you're doing this is time. And effort.
When i was 17, i began to draw. Take it easy, you'll be very good, but you can't do anything without practice and study and a lot of hard work. I mean, if you really wanna be a pencilller or any kind of illustrator, you must study first. Study a lot, at every opportunity.
Check out the anathomy, Toriyama's technique and the general manga technique. Maybe you're the best in your block, or the best in your house, but always will be someone better than you. So, study and practice.
This reminds me of my own very early pics.
Keep working, and don't forget that HARD WORK is everything.