Have fun with it. For cold starting, pump the bulb to prime the carb, and set the choke. Pull it over a couple of times at full choke, then without choking if it's stubborn. When it fires, you may need to half choke it until it warms up a little. Additionally, you might need to set the mixture about 1/4 turn richer (counterclockwise) for cold starting and warm up, then return it to the original setting. And....make a mental note of the cold starting procedure that works for you.
The pan appears to be very clean. If there is any seepage from the t.stat gasket you would look for it around the cover or in the pan below the thermostat. After running, wrap a piece of paper toweling around your finger, and dab at the seal -- should be no moisture (and of course you should see no leakage). The head cover and gasket are unremarkable in your pics, and you also had a good compression test (wouldn't think there are issues).