sigh. all right, in a rare stab of humanitarianism, i am going to attempt to help you.
I've only been here about a year and a half and am already tired of the PLETHORA of people who post incredibly dumb comics then ask for opinions only to take offense when some of the regulars tell them how crappy the comic was. if you aren't prepared brutal honesty, don't ask. many of the regulars have been on this site for years, and have had literally thousands of horribly unfunny comics thrown at them in that time. cut them some slack....
ok, here we go:
first things first. the character you've chosen is clearly a goth. punks and goths don't share much in common except liking shitty music. they don't look anything alike. secondly, why is he saying "rrrrrr"? it comes off as forcing him into the role of a zombie when there is a perfectly servicable zombie character available for all your undead needs.
nextly, why is this guy terrified of a 100 lb goth boy? it doesn't make any sense...and why is he then more afraid of a punk than a zombie? i'd rather fight a punk any day. one punch=fight over, whereas with a zombie, you have to destroy if fucking head
last panel: you wasted a perfectly good opportunity to get in a last crack with the 'punk' character or setup the punchline. what the hell is "...?" how does that add to the comic? how is that funny? its not. and the man's response (which BTW constitutes a punchline) is uninspired and lame. there were a million other things you could've written there and every one of them would have been funnier.
hope this helps