While there likely is a better way, one of the methods I've used is to 'select all' and double-click
which by default launches Preview, and then you could use up-down buttons on keyboard to see
them. However, should there be any issue with differences in horizontal vs vertical shots, you
may have to tip your head to see them. Some cameras do not remember where Earth was...
The ideas and means of viewing images varies with OS X version; as mine is older than
Mavericks, & how my images get processed (minimal) there is a method to my madness.
And mine do not use iPhoto for any part of the process. Did find a free application to be
helpful with several kinds of edits, called ToyViewer. No longer available direct from maker.
(And there is image capture, and iphoto, if you use them.)
Good luck & happy computing! 🙂