The timing covers usually leak right under the top bolt between the block and the cover farther under where yours looks like.
To me it looks like it's coming from right in the corner where all three come together (head, cover and intake)
If that ends up being the case it's the intake gasket corner where the coolant passes though the intake.
Evenly all the way around the intake, tighten it just a 1/8 to 1/4 turn on the bolts but start at the center of the intake and work your way out to the ends so it doesn't try to snap the corner off.