/ic/ - Artwork/Critique

I'm flipperhanded freak with no motor skills, but I still got a cheap Wacom (I initially thought it would be flatter, more mobile replacement for laptop mouse) and so i decided to draw.
I always loved the way Gogh and Monet drew amazing landscapes with just a few simple strokes of the brush, no accurate line work or smooth workso fine you could not even see single strokes anymore.
I experimented a lot in Krita and I especially love how some of the tools can be used to smudge, trail and wash other strokes already placed.
So I picked up my pen, traced a few landscape shots, tried to learn the importance of light and how shadows fall.
I now decided to draw a scene just from reference material, not directly tracing it.
I figured I'd go from broad, soft strokes with wet paint tools to finer dry tools to give texture.

How am I doing so far? Are there any good exercises or instructions to this style of painting? (it's supposed to be a waterfall in a tight ravine