Well, the first map is the most recent one. For instance its just finishd for the Spain version of National Geographic.
The map is make up with SRTM DEM Data rendered in Visual Nature Studio and a Landsat Satellite image as overlay.
Its not just a rendered map with a 2Xor 3X vertical exageration, its rendered with 1X + 2X + 4X + 6X exagerations merged in photoshop with a masking technique, so the Etna and sorroundings appears 6X, but lower areas are 1X or 2X, depending, just and only, on the visual appearance (no thumb rule here).
This is required since Sicily's relief has a lot of little mountains that results in a "noisy" terrain when viewed in 3D with huge exageration factors, but, with little exageration, makes Etna no significant at all. So... I want the Etna and north mountains be distinguised... the trick is just to "eliminate" low mountains and exagerate the Volcano....
The texture is a mix of images from Landsat, shaded relief, slope shaded relief and green - brown hipsometry.
As always, and as a last touch... a very very light Haze effect in the background to force a 3D perception.
AS always, I love the look of your maps. Great to see the changes over time. I'm curious about your source or process for the first map in this list (from the top). Anything you can share?