I added the thought bubble. I am sure someone else can do better but it is good picture.
I suspect that it was easy to catch two mice because there was a nest somewhere near the house and this nice looking grey cat raided it.
The cat has the appearance of a Chartreux – smiling and skinny legs. This cat breed is known for these traits.
What a very handsome looking cat. (My guess is a British bred Russian Blue.) He or she, looks as proud as punch with their hunting trophies. I wonder if the cat placed them side by side or whether the owner did that?