Bird Merchants cuckoo

I'm already in shape I just want to get more muscle? (Pics included) PLZ HLP? - how to take pics off tinypic

Im 21 5'8 "and around 150 pounds
How do I gain more muscle, without fat or a growth of stomach?
I hate my ARMS peeeoooony think they are! I do not wear short sleeves, just as my arms, I can not ... I do not know my shirt, I can not bear it, HELP!
Here are two pictures of the body are

http://tinypic.com/view.php?pic=6ss74p&s=3
http://tinypic.com/view.php?pic=200a8ar&s=3