I call the touchdown signal above the "Roller Coaster". It looks like he is on the top of a hill ready to speed down and through a corner.
One thing that I personally think looks bad is when we hold our arms up for an extended length on incomplete passes. Like for a USC foul or something, just looks bad.
Something else, why would you give the stop the clock signal in addition to the incomplete signal? Do you do the same on touchdowns? Touchdown first then stop the clock? Just curious.