Follow the advice above about punctuation and narration and stuff, and you will be on your way to funnier comics in no time! Also, before you hit "save", look at the comic for a minute or two and think of ways that it could be made funnier. You won't believe what fantastic ideas will pop into your head at the most unexpected moments!
I liked this line: "Im Not A Little Girl, Im A Pimp, And We Are At The bottom Of The Ocean."