When a guy puts his hand around your shoulder vs. waist.. Is there a dif?

I really like this guy and we've been friends for a while. At first he would put his arm around my shoulder when he hugs me goodbye and what not. But now if we're taking pictures together/ he's guiding me through the crowds/ giving hugs/ etc. he would put his arm around my waist and not my shoulders anymore. Is there a difference when a guy puts his arm around your shoulder than when he puts it around your waist?
When a guy puts his hand around your shoulder vs. waist.. Is there a dif?
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