This one has more variety than the other one in that it has many different art styles and shows the characters in many different scenarios. Again, I think the only way I can critique this is to critique each image individually.
First image: the line tool really doesn't do this piece any justice. if you are using a mouse and don't have a tablet (if you don't have a tablet you should get one) then the line tool is fine and I can understand you using it but you need to vary the line quality in your image or else it will look robotic and mechanical. The arm just sort of curves into the hand (no wrist) and the nose isn't consistent with the other noses in other pictures of Willie D. Also, the guy on the right looks pregnant
Second image: creative, interesting. My only suggestion is to make the bed look more realistic.
Third image: good.
Fourth image: Mitt Romney's face is blue (is it supposed to be blue?) also Willie D's head should be about the same size as Mitt's head.
Fifth image: the anatomy looks a bit odd.
Sixth image: good job
Seventh image: the lines are too thick
Eighth image: Willie D looks very different in this
Ninth image: nice alternate Newgrounds logo
Tenth image: It's not zoomed in enough so I can see it
Eleventh image: His arms should be less fat and should extend longer
Twelfth image: Dexter's face looks disjointed
Good job.