My idea of this challenge is as per the map concept.
I am not sure whether to stay in monochrome or do some light colours.
The final map will have some more labelling and perhaps some dragons flying around the tower (if I can draw them) A ship in the bay or river . Some more explanations And probably a overall monochrome wash to make the paper look a bit weathered (not Grunge)
### latest wip ###
Click image for larger version. 

Name:	towerconcept.jpg 
Views:	265 
Size:	252.3 KB 
ID:	37373