Han River Purple Streaking 270

I like this shot. Camera half-submerged sideways. The Han River’s all purple streaked like night-time traffic on slow-shutter. In the distance is the south bank.
I live near the Han River now. I’ve been biking on it a lot. I kind of want to do a movie about it, but I don’t know the concept yet. Does it need a concept or can I simply just film it at different types of day in different seasons in different weather, and then compile all my favorite shots?