How do i make a sig

I have a good pic that i want but its too big how do i make it big enough but yet big enough to see, i made it without knowing its going to be so skinny so am i going ot have to make it again ? also tell me how i did for my first photo shop image

http://static.flickr.com/65/22627363...0ec502.jpg?v=0

if you want to learn how look at the sticky at the top of the forum.
and im sure someone else will post some tips and etc