After several hundred frames of these sunset splits, this was the one I was most excited about before the edit- it's hard to get the fin sharp and bright. It appears to be a pregnant female, and I find the pose peaceful.
You can see the way the water magnifies and changes the image here- this is the way the camera sees both as a single image. This refraction causes the body to not line up evenly
It's hard to know if your camera is perfectly level when you aren't looking through the lens. A slight upward angle obscures the dry part of the frame.
After the sun sets, there are still some opportunities for a good capture. With no natural light, the auto focus can struggle to lock so consider pre-focusing.