I'm new on the site and I just wanted some advice on my first two comics. 

The first thing you should do is get rid of that annoying "border=0>"

 You can do this by just pasting in the url of the comic and leaving out the [img] brackets all together.

i like the first one simply for your use of the beer drinking slob as rosie o'donnell.

and i agree, she needs to die.

So, thanks for the comments so far. Is there anything I need to improve on so far?

In the second comic, your dialog needs to be a little more believeable.  I don't think anyone would really answer this:

Really? Then what would be the way to... "win" her heart?

 with this:

Well, legends always talk about a woman falling in love with a man after being struck by Cupid's arrow...

So it sounds like your forcing the set-up to support the punchline.  Try to make the speech flow more naturally and you've got a funny comic there.

Okay, I see what you mean. Thanks for that.

The first one's really good. Make more.