I would start with words only first as as soon as I showed my dd pictures as well she was more interested in picture slides then. But the best way is to follow your child to make the session fun.
We were doing two sessions a day and then later we added the picture slides as well. And then in some time I was showing her all of them.
We don't use multisesory all the time we use it from time to time to make the sessions more interested for her.
I also have to play the pattern phonics first as if it is on the end she is not interested in it. If we play it first she also repeats the words
which I am happy about as we use LR to teach english as a forein language.