One thing I really like about this is the bushfires and the smoke that recurs in the verses. As a suggestion, you may consider rewriting the chorus to use the fire/smoke theme more directly. "There's a fire in my heart...." or something.
Although a strict adherence to rhyming schemes can get monotonous, I think a song really needs some rhymes to work properly so you may want to look at adding some rhyming in the verses.
-Doug
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