He probably means that you're an all-around stand-up kind of girl.
When he calls you beautiful when you literally just finished volunteering at a shelter, and you're sure you look stressed, he probably means your personality.
If you are a unique soul bestowed with a gift for creating inspiring art, he's probably in awe of your beautiful gift.
He probably sees you as his soulmate and his other half. He doesn't just see your individual attractions. Instead, he sees the whole, and that's why he's careful.