well. it seems to me that the coolant is coming from the small hose between the pump and the engine head. the hose seems worn out and the head port is very rusty at that point (pics 4 & 5)....

also, when looking at the thermostat housing (same pictures), there are some small and faint traces of rust and coolant marks. check the thermostat gasket........

the front timing cover might be a little leaky, but it does not look severe, at least not to me

run the car and let it warm up and idle, then you should be able to see the leak, especially the coolant leak...

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1993 300E, 2.8 M104 .....