Is that bow 66" or 68" ? Your string angle at full draw appears to be +90deg. Bow appears to be tillered a bit short of your full draw. Your bow arm seems to be pushing a tad excessively toward the target, a touch forceful, not dynamic or fluid. Keeping a fluid bow arm allows for you to adjust elevation and windage as the need arises, a forceful bow arm is for shooting targets.
A nice walk in the woods, shooting stumps, at unknown distances, one at a time, shoot, go get arrow, find another target, repeat.
I would not necessarily, "relax," the bow arm, just not try to force/push it forward or "lock it in the bent position." Fluidity, grace, and smooth movements.