Why did I write this in the pic? Must be something special about this spot. What's that silly arrow doing there on the right?

AH! This is where the instructions come in handy again!!
Now lets just see...
Do you suppose miss FatalFanatic meant this? I think so!

I think that by now, you should be able to guess the next part.
Indeed! Well guessed, little green line.
Now to fill in the rest of the map! The last part of this trilogy is here