Hi there and welcome to the forum!
I think you need to spend more time on a map. Have patience and make every little detail as good as you can. Take the settlement "Nightwood" as an example. The walls that surrounds the houses are very sketchy, and I am sure if you spend some more time on it, you could make those walls with straight lines. When you got the lines down, then try things like shadows and highlights. But i'd say - spend more time and effort on it. There are really no shortcuts. The great maps you see here have taken a LOT of time to create.