Hi and welcome to the Cruisers Forum.
I don't know if a few drops is a concern. I had a small one cylinder Yanmar
a few years ago and I was happy that it ran at all. At least there's an indication that the return line is not blocked.
If I were the totally obsessive type I'd be tempted to put a finger on the return line to see if it were hot.
My attitude is that as long as regular maintenance
has been done and there is water
coming out of the exhaust
then all's well, though others may differ.
As a new owner I'd suggest getting used to the sound of your engine
. If it changes then time to start worrying.