Josie Posing for me

She's worried I will bring her inside. I have to bring them inside when I can't supervise them in the yard to keep them safe from the neighbours.

When I view these photos larger, they get grainy. My brother said it's because I've got the Iso on the highest setting. So now I have to try and get good photos with a lower iso. (after discovering that the highest Iso was getting good pictures).
I don't understand cameras, the physics, and I would love to learn the physics one day and understand it in my mind what I'm doing. I'm always guessing at the moment.