It would have been a lot funnier if it had been shorter and punchier. The period between the set up and the punchline was too long and threw off the timing making it difficult to know exactly what was going on.
For example, the shot of the phone ringing should be shorter, just long enough so that the audience knows whats happening. Then the shot of the mayor being strangled should come in two pieces, one before his head explodes, which should be interrupted by the scene of the girls twerking, followed by the one where his head actually explodes, then follow up with the girls twerking again ending it the same way. This way it just really drives home the point that they're dumb bitches.
The art could use some work, but that's not a huge deal honestly. I'd say so long as you work on your pacing the quality of your work will really shine through and everything else can be developed with time.