I was wondering about the new-ish species Antillean Skimmer (don't know the scientific name, or even if it has one yet). Or possibly Orthemis ferruginea (Roseate Skimmer), which is the species it got split off from. In theory I have a book that might let me work it out, but I have no idea where the book is so that's not much help.
The third photo looks very good for female Orthemis ferruginea, but without the book I'm not sure if it's even possible to tell the two species apart from photos. The internet is full of photos taken before the two were split and when it comes to that side of the Atlantic I only have book-knowledge.
The last one I can't get any closer than "dragonfly", sorry.