I think your temperatures just fine.Only changes I would make to your enclosure is to cover back and the two sides some type of cover either Brown paper bag
Or regular aquarium background material.
This will help lessen stress on your new frog.
Also I would get rid of the gravel in the water dish.
Depending on the size of the frog that you're getting this could pose a impaction risk.
And also makes cleaning out the dish on daily basis tougher.