Ocean Beach At Dusk

I keep  learning new words for my favorite part of day. Remember when I told you about the blue hour? Recently I learned that another word for that is Civil Twilight. And separate from these is the idea of dusk. Civil dusk starts when the sky stops being light blue, and when you start needing a light to read outside. So my guess would be that this picture qualifies as dusk, but also as part of the blue hour. Anyone who knows better is welcome to comment!