Thank you so much for your amazing tutorial! I just used your tutorials and I can't draw mountains ... and they don't look as good as yours but they look a helluva lot better than what I would have done on my own. Thank you for sharing your knowledge, I hope one day I'll be good enough to do that too.
i just used standard round photoshop brushes here. its more about the use of color and form, and this can be done with any paint brush. (The clouds are also basic brush strokes smudged with a flat brush)