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Aha yeah I've also been to the top of Teide, pretty good example, lol :P
From a geological point of view you'd want to have a shallower top (so the right one), try making the sides of the volcano top follow the angle of the mountain too. One feature also I'd recommend just for a terrain feature, is maybe have a clear defined channel coming from one side of the peak, with the remnants of a previous eruption and lava flow?
Something similar ish to these:
(It's hard to find an appropriate image for what I'm trying to suggest ha).
Lol just a couple of ideas, love the work so far though! Keep at it ^^ :D
Haha, love it.