Be aware that if you paint from any shots you take of strangers on the beach or in a park, you need to get their signature on a model's release, especially if the painting might ever make it into your portfolio. There are privacy laws involved and the subjects of your photos/paintings may well see or hear of the painting you made of them. It's better to get the legal issues out of the way up front.
When my kids have been photographed in candid situations for local newspapers, the photographer takes the picture, then approaches us for the model's release. That way he gets the candid photo, but only uses it in the paper if I sign the release. (I guess you could call this the "shoot first, ask questions later" approach!)
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