WHAT DO I DO

So my 11 year old brother needed my phone for his homework and I took a look at the assignment and thought it should take about 5 or 10 minutes so why not let him take my phone. About 30 minutes later he comes over to me and says my phone locked and asked me to open it. I open it and the first thing I see is a mostly nude picture of me from my camera roll that I took IN DECEMBER. I am absolutely mortified! He was obviously looking at it for long enough that the screen locked... that is literally THE ONLY scandalous thing I have on my phone PERIOD and I didn't even remember it was on there. WHAT AM I SUPPOSED TO DO???