Yep they all stack. You can take a mouse of a man and make him a lion with all three spells.
Im not sure how potions affect the magnitude of these spells as I've never used illusion potions. But if its any similar to how they affect frenzy and fear spells, my guess is they would increase the magnitude.
Fortify Illusion enchantments on the other hand only reduce the cost of casting spells.
Yep they all stack. You can take a mouse of a man and make him a lion with all three spells.
Im not sure how potions affect the magnitude of these spells as I've never used illusion potions. But if its any similar to how they affect frenzy and fear spells, my guess is they would increase the magnitude.
Fortify Illusion enchantments on the other hand only reduce the cost of casting spells.