What do you think about me asking my boyfriend for a dick pic?
Why do you want to ask him for one?
I was thinking about it for a while, but I don't know if he'll show me.
If he wants to show you then it's fine. It's typically expected that partners will want to see each other naked.
I'm not sure if I want to see his dick or not. I think they are all ugly.
If you really feel that way then you shouldn't ask him for a picture of his. It's not required to do so.