Thanks for the feedback J., Ravs and Chickpea. The barrows map illustration was the first piece. I had fun playing around with the cartoon style on this map. I may experiment around with this style some more in future works. Although it wasn't intended to be exactly to scale, I did try to align the interior barrows in Level one with the exterior ones in the drawing. Basically I just overlayed the exterior map at low opacity over the Level 1 map to make sure that the interior was approximately where it should be.

Cheers,
-Arsheesh