I'm thinking the human should bring a bit of everything, but excel at nothing apart from courage. "Heart" is a bit odd. This isn't Captain Planet. :D

That said, so far it seems good:

Elf: Wisdom
Halfling: Dexterity
Dwarf: Constitution
Dracon: Intelligence (and some physical strength, I guess)
Lizardfolk: Strength
Human: Balanced

And congrats on your move!