Yes that makes sense to put the best photo first I had really not thought about that
I think whats most important is what the posting does for you, mine is more my photography journey, but I am finding i slowly add more writing to my posts than I ever used to and I think for me thats a good thing, I am normally very reserved and just used to share photos and never say much else.

I have done the same slipping in a nugget or a question deeper into the post, and find there is really only a small group that read the posts fully, but each to their own :)