So are you hand drawing all the contours over an older raster image? It seems like you have already broken the back of it with only some inland sections left. I find the less wiggly contours to be less fun
What are your plans for presentation? The current multi-coloured setup makes it look very much like a technical map or schematic. Will it stay this way?
The different elements so far look extremely convincing, especially given you're hand drawing them.