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I enjoy the mountains more than the dragons! Nice shapes, and a decent colour palette.
Apart from appearing a bit bare up top, I'm struggling to crit it at a technical level, since everything does the job.
I don't think the mountains or dragons need anymore detail, since you're illustrating how impossibly BIG these things are.
They're size is so difficullt to comprehend that not even the mountains do enough justice. I think they need some clouds or some atmospheric mist to really show their size. I also think these dragons are just passing through, temporarily roosting on earth's mountains before flying off to another world, since they surely they're too large to rest on those mountains.