Hi cartographers from all over the world!

I joined today to this forum, but for about a month I was using it. Lately, me and my friends played D&D campaign, and had encounter in the mines, so it give me idea to make mines we had going trough. This is my first attempt to make map like this. Before I make outdoor maps of continents, but never dungeons and never isometric map. This work is still in progress so I hope you will give me best advices how to make my final map better.

Click image for larger version. 

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P.S. I got to thank the Herwin Wielink for his great work and enthusiasm he give me with his work