When reducing the resolution the game will sometimes increase the setting to be higher quality. This can leade to aa being turned on and other settings resulting in a better picture quality. Characters will appear bigger as the resolution is smaller, what use to be 1 in high is now about 1.15 in high. Thus if you lowered your resolution more you will get bigger characters. However, this limits the field of view as you are now more focused on the characters and not the surroundings.