Your goal is to show the quality of the photos, not to show your animation skills. Otherwise you’re doing your client a disservice. The side benefit of this point of view is that the result may end up being simpler than you thought.
The best design solutions lie in achieving an understanding of the challenge.
What is the challenge? To show the photos to whom, under what conditions, to get what reaction?
You want to make the photos look beautiful, yes?
What is beautiful about them?
Where can you see the photographer’s eye in evidence? Choice of colours? Choice of composition? Choice of moment? Consider highlighting that in each shot.
What are the subjects? Sports? Fashion? Architecture? That will dictate the pacing … but be willing to change the pacing to suit the material when desirable.
Always serve the material.
What do the shots have in common? Can you find a pattern?
Can you find where one shot seems to want to lead to another?
Does one shot seem to go with another? Can they share the stage in some interesting way?
Which shots can be large? Which can be small? Which can be repeated?
Do you have a music track? Listen to it over and over first.
If you’re still stuck, you can search the COW Posts for “inspiration” — there should be some links posted.
Anybody else?