This is attention to details man
Ganon holds a bow straight while Link holds it at an angle.
Ganon also draws the bow like a samurai, (since this Ganon is more samurai like) he positions/aim the bow then draws.
(Not shown here) Even if Link uses a long bow like Ganon he will still aim at an angle since he is a soldier. He positions/aim the bow and draws at the same time.
The bow Ganon uses will recoil meaning this is a heavy bow. (They didnt need to add that detail in, but they did man)