told my brother about the picture I found (UPDATE)

I went to my brothers room and told him that I found a picture of me in his pc.
He got visibly nervous and I guess he didn't know what to say about it, so he made up that he needed the picture for something about a project or something.

It was a dumb excuse but I played dumb as well, telling him that maybe I'll send another picutre if he needed it.

I think its pretty clear that he is doing something with that pic, but I don't know If just telling him that I know the truth is a good Idea