The first one you posted might've had potential, but you blew the punchline. It was pretty obvious that the cop didn't understand he was talking to the killer in the 3rd panel, so there's no joke there if you just continue that status quo. Liven it up with some wit or a twist we don't.
The other two, unfortunately, were hopeless. But I don't think you're hopeless as a stripper.
Yet.