That's pretty good for a first try
Perhaps it would help if I showed you a B/W commission piece that one of my Guild friends did recently. Although I have not as yet drawn a black and white map, I am aware of the theory through my art training, and there is very little difference between designing a good black and white line art poster, and a good black and white line art map...
This is a commissioned map - the
Northwest Province of Omnourra by GLS. In it you can see that varying line thickness and simplification are two of the most important considerations to be made. The white space in the map is important because it separates the elements of the map - the mountains from the plains and the forest, and so on. The different line thicknesses help us to identify the elements for what they are, so that for instance the overall shape of a mountain is drawn in a thicker line than the details, and the lines drawn around the coast are thinner and less important than the coast itself, but give the impression of water.
The map is an abstract of reality. You would never see a black line running along a ridge in a photograph of a real mountain. Nor would you see the long thin lines trailing down its flanks on either side, and yet in the map... its a mountain - as clear as day. The same applies to the coast. There is never a thick black line on the beach where the water ends, and the waves beyond the water's edge are never fringed in black - and yet those lines on that map are clearly the coast and the water.
You would do a lot worse than examining this lovely example of Greg's, and trying to grasp the essence of just what it is that makes it a great B/W map.
...
The abstract nature of a piece of line art is a very difficult concept to explain, and because I'm not really all that good at explaining things, its probably not that easy to grasp just from reading my bad explanation. But I hope that it helps you to think about the way you draw your map in ink, since it's not all as straightforward as tracing the colour version