ok you see the leak as being at the lower front corner of the head, but i believe that the leak is where the intake meets the head. why? because you had the head milled, but you probably did not have the intake also milled, and as such you have changed the relationship between the intake and the head.
most of the time when the amount taken off the head is small, there is enough "tolerance" that there is no issue. however production tolerances being what they are, and with tolerance stack being what it is, there is the possibility that you ran out of tolerance and now have a small leak. it wont get better over time just worse.
what you need to do now is measure how far off the manifold is from the head, and determine how much the intake needs to be milled to bring things back into tolerance.