These are great starts, hand-drawn maps are hard to do well, but exude personality. I would suggest that the way to improve is to initially find something you like the look of and learn how to copy it. Try mixing media too, use ink with your pencilwork, or buy some watercolours or gouache. Once you learn how to copy stuff it's a much easier step to produce stuff of your own (It'll probably happen naturally).

Both GP and I are with you in our love of Ukiyo e landscapes - I live in hope that GP will go back to making his painting kit for it. Or I could pull my finger out and do it myself of course!

Cheers and good luck with the mapping.

Ravs