This has a very good looking crumb! I've been doing a few rounds of bread baking this week, and even with yeast my rise is about the same as yours, except yours takes only 10 minutes of prep and mine takes 3 hours!
Adding milk and peanut butter sounds really yummy, I bet this bread has a very rich flavor! If I made this I would probably add a few chocolate chips in the dough so that I can have peanut butter and chocolate together - a match made in heaven!