Very impressive!

So you've switched to Photoshop for the creation of your latest WIP? I remember you telling me that vector-based programs such as Illustrator are much more effective at creating detailed maps such as these; also, vector-based files are smaller and thus easier to handle. You previously sold me on Illustrator but now I'm not so certain.

Do you use real life DEMs in your work, or is it all hand-drawn? And, finally, in your opinion, could I achieve good results with only Photoshop and not Illustrator?

Again, fascinating work!

Peter