It doesn't look like the lower hose [top] but check the clamp none-the-less. My guess, judging from the pics, is the upper hose clamp at the thermostat on top of the block just behind the radiator. That one is a little harder to get at. Some are able to remove the top radiator mounting bolt [1 - top left of center] and pivot the radiator forward and squeeze your reach in behind to tighten the clamp. Me, I couldn't do it that way. I had to drain the system and remove the radiator to get my hand in there. You can also access that hose from above, but that's a ton of work. i.e. remove tank, airbox and the demon radiator shroud.
That upper hose clamp at the thermostat is notorious for loosening up.
Also check the threaded hex head plugs with washers. Especially the ones in double line red boxes. These seal the coolant channels.
Use a flashlight to peer between the intakes to see if there's any antifreeze sitting on the block [forward]. It may may be hard to see around the pair valves, unless it's been Desmogged.
