Depending on your physique and build, your ending posture will mainly depend on the pitch itself, how your feeling at that moment, the surface condition that your perfoming off of, and your interpretation mentally and physically of your performance at that time --- accounting for any adjustments that your dealing with.
I know this is a lot of ..."IF's" not a direct answer, but it's important to think about each plausible scenario .. either seperate or combined that will leave an imprint on your work.
Take for example the dubious hanging curve. Regardless of how impressionable your ending follow through was.. I'd bet even money your looking at the Commissioner's signature bouncing in the parking lot.
And if your just coming off an illness ... say the flu... then your not going to be 100% and thus is your concentration and body language will follow suit.
And for some guys, their ending follow through is so predictable for certain pitches that they can actually tip their hand even before they finish the pitch.
Extremes on this subject can be found with Bob Gibson (1959 to 1975), Whitey Ford (1950 to 1967), and the great Walter Johnson (1907 to 1927).