I think you should do everything you suggested - Compass, illustrations, etc. Not absolutely necessary, but I do think you should add some type of framing, where the map stops and a white margin to the edge. Also consider some kind of grid in one hundred or 500 meters just to help us understand scale of the structures and complex. Then perhaps label/number your grid at the edge before the white margin.
Its only January 10th and the challenge is open to changes until the 26th - you've got plenty of time. However, if you're own life is too busy, its understandable. I think these added details would complete your map!