Based on the position of the camera and current time of day, the sun is over powering and the camera's exposure adjustment washes out so much detail. If the system is able to determine the information it is trying to discern from that image, I'm impressed. You can't even tell what the sky looks like from this image. I'd try hooding the lens to see if you could get a better image when the sun is shining directly into the lens like this.
What would happen if someone geolocates your camera and just plants a bunch of umbrellas in the frame? Does the counter require the umbrella to be held by a human? What if the same person walks past the camera multiple times? Are they considered unique counts, or are you recognizing people and logging that?
TL;DR how robust is your system against mischievousness?