Just a few ideas for discussion. Nothing set in stone. I was aiming for fun and interesting without ruining balance or making archery too easy.
Overdraw - You draw the arrow further than the norm, your stamina depletes faster when you hold the draw but you do +5-10% damage.
Hunter - You are in your element hunting in the woods, not fighting in the field. +1 stealth skill in woodland +1 bow skill in woodland. Bows make less noise when you fire them. Not compatible with military archer.
Military archer - your skills have been honed on the battlefield. +1 bow skill, +? piercing damage, +1 strength when using a bow. Not compatible with hunter.
Longbowman - Longbows are more steady, for longer at full draw, +? piercing damage when using Longbows. Not compatible with horse archer.
Horse archer - +? Bow skill when mounted, +30% draw speed when mounted. Not compatible with longbowman.
Scavenger - Your arrows are 50% less likely to break.
Ranger - You can craft basic hunting arrows when in woodland for the cost of 1 energy + 1 nutrition per arrow.
Fast flight - you have expertly tuned your arrows to fly faster. Increased arrow velocity over range (decreased energy loss), -5-10% damage. (damage loss is to balance fact that speed is tied to damage in engine)
Deadly tracker - You know where to shoot to make them bleed. +30% chance of making a target bleed -15% piercing damage. Targets leave a blood trail on ground for first minute of bleeding.
I am the night - Reduced bow noise at night. +1 stealth when using a bow at night. Increased weapon speed at night. The opposite effects during the day.
(Now it is about 150 degrees)