10x.
it took me some time to get it correctly,
but eventually, I'm sending the parent image, the neighbors, and some prompt.
at first i had a rule that if there is a neighbor, we must use flux, but flux was too blurry, i guess because i gave it the parent. so nano banana is used 90% of the times.
btw, you can create your own world and change the rules, so you would prompt each time you discover a new place