The coolant appears to be pooling on the valley tin ABOVE the gasket surface of the tin and intake manifold. That would lead me to believe that you have a leak in the round rubber seal between the intake and the water pump. You might see if the bolt that snugs the water pump up to the intake manifold (located to the right of the round gasket) can be snugged up. But it is likely that the seal has hardened. My engine had the same leak and it seemed to leak more when the engine was cooling back down.
You might get by with just buying the water pump gasket set which includes the rubber seal. If you replace the intake manifold gasket, you may need to pull the water pump and replace its gaskets too just to make sure everything gets aligned and torqued properly.
Doug
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