Ah, good old Butch Hartman. He delivered us great cartoons to our younger selves with contents ranging from unforgettable characters and amazing storytelling. I am astonished with you impersonating his art style. If you keep up the great work, you will surely succeed.
(However, the brush sizes on the faces of the left and right head are a little more bold than the one in the middle. That's just a small mistake, nevertheless.)