Besides no water proofing on the stingers to the lights, horrible stand configuration and no sandbags on the Fresnel behind the actor, which is WAY too close to the pool edge. I don't think that the boomed soft box is properly weighed down. And the unattended jib arm is not very confidence inspiring. That monitor on the pool floor is dangerous also. Wow. Where did you get that pic?
If I were on that set I would want GFI (ground-fault interrupters) on all the mains power lines. No PA, however quick and conscientious, is fast enough to keep anybody from possible electrocution in case of accident or failure.