@Ilanthar - Thanks very much. I think I'm proudest of the "break throughs" with regards to the canyons and the desert. It took a bit of thinking and experimenting to get those looks, and I'm still developing them. The grassland and steppe looks are hard to get right. Easily over-done or under-done. I'm still working that out. I'll put a link below to an unfinished tile for a computer game I was bidding on that shows the desert in color.

The mountains are truly just a joy for me to work on. It's almost as if making maps is just an excuse to draw mountains. I go quickly into a flow state where I'm just letting the "ISO mountain algorithm" run in my brain, telling my hand where to lay down the lines, fill in the shadows, and paint on the highlights. I still have yet to allow myself the luxury of replicating any mountains on any of my maps...though I may have to, someday, as deadlines get tighter.

Click image for larger version. 

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