Never, ever use a freebie as a reference unless it was legitimately done pro bono. That doesn't mean "don't put the work in your portfolio"; it means "don't give a potential paying client the idea that you can be talked into another freebie".

The only example on the list I'd use as a professional reference/referral is the first. Your portfolio will speak for itself, so the quality of the finished photographs can be judged on their own merit. What they don't say is whether you were professional in your approach to the work, seemed to know what you were doing, met the clients' actual needs, had any necessary permits arranged for (or were even aware that they were needed), were aware of and insured for potential liabilities, or whether your estimates of time and cost had any bearing on reality at all. More importantly, did you deliver the promised value? (That's really hard to determine if the commercial value of your work was essentially nothing.)

In other words, your references need to be business references (or employment references, if they're coming from a principle photographer you had assisted). Anything else is, "yeah, dude showed up with a camera and pictures happened eventually. They were okay." You'd be better off with a great photographer's portfolio and good references from unrelated work than with mediocre and meaningless references for spec work. (It's okay to be new to the business—every working pro was at one point—but it's not okay to wear a sign around your neck saying "I'm new, please kick me".)