I’m just a student so you might want to take my advice with a grain of salt, but I think you’re on the right track. I would include a match to live action and two or three very strong other pieces. It doesn’t necessarily matter what they are as far as indoor vs outdoor etc, but they should show you understand things like bounce lighting, colors lights should be, what types of lights to use when and why, control over shadows, and an ability to problem solve when lighting. Some ideas would be trying to convey a particular mood or trying to match the lighting in an already existing scene (e.g. a photo of something.)
Since you want to work on moving pieces (you’re not going to be lighting still life setups at a studio), you should at the very least include some kind of camera move - it doesn’t need to be an extreme crazy roller coaster ride of a fly through, just something to prove your lighting holds up from different angles. For the match to live action it would probably be preferable to acquire a camera, do a real life camera move around something like a table and then add an object to the table in CG (or something along those lines - it will win you extra points if the live action plate is not a CG object composited onto a photo, though that would be ok if you absolutely can’t get a camera.) Still images are ok if you absolutely cannot produce anything else, but there’s no reason you can’t add a slight camera move to a scene (like if you were lighting one of the lighting challenges here.)
It does suck that it’s so difficult to get access to already animated sequences to light. One option is to find someone who is an aspiring animator (maybe look in the “finished animations” section) and ask if you can light their shots (you’d credit them for animation or whatever in your reel and vice versa.)
EDIT: Also, not to try to go against what anyone else tells you, but I have known three people who did lighting internships at Pixar in the last year and one more who was hired as a lighter this year and none of them had animated scenes or even anything really stylized on their reels beforehand. Not to say it won’t help you but don’t bust your balls worrying about it if your photoreal stuff looks amazing.