Under no circumstances should be ever an arrow sticking out of completely unarmored head.
Buff archer's damage and missile speed I'd say.
Rather missile speed and accuracy. The damage is extreme enough already, and could do with a (small) reduce if they tweak missile speed and accuracy for the better. And, repeating myself again, ranged looms shouldn't increase damage to make non-loomed ranged more viable. It would still be worth looming it because of increased accuracy, rate of fire and missile speed.
Here's the result of me chasing a horse archer, yelling
shoot at him:
In the end he made a bad turn, and I one-hit him with my 1h sword. Horse archers without looms are ridiculously weak.