I gather everything up and bury it in my front yard or take it to the crossroads with a payment.
Any omens would be personal. You might want to contemplate it for yourself and verify with other forms of divination or folklore. Keep a journal to list all the omens you personally perceive. It would be a nice way to start building up your divination method.
My personal interpretation:
It could mean that the flow of the spell was interrupted by other influences. A heart could be the need for love or the "heart" of the matter needs to be tended to (if the spell isn't for drawing love). The shoe could mean communication, physical work, or visiting someone. Maybe there is a need for communication or there isn't a foundation to build the spell upon which interrupted the flow.
This is one way/how I would perceive it.