I don't usually do this, but I was super bored.
I imported your map image to FEMapCreator which broke a bunch of stuff. I spent 10 minutes rebuilding it, then I made a bunch of edits. This is my vision of how the map would look.
If you want to use it, here's the .tmx file.
And a .zip of it if that fails.
I didn't know what to do with the bottom. Too lazy. Maybe you can fix it.
Edit: Definitely missed a few tiles for shading, and the top right room for the treasure chest isn't shaded right either. Miscolored tile near the throne. Needs a few more fixes, but hopefully it helps.