The best time of day is usually later than people think,
and for good reason.
If you want senior pictures that look natural, flattering, and easy, the time of day matters a lot. In Florida especially, light changes fast, heat changes the way people feel, and the wrong timing can make a good location look a lot harsher than it should.
Most of the time, the best senior pictures happen when the light is softer and the air feels a little less punishing. That usually means the session needs to happen later in the day, not right in the middle of it.
"Good light makes everything easier. Bad light makes everything harder."
Jeff Jansen