The dithering kind of gives an overall weird texture, but this piece is just so charming! I like it!

yeah it needs to be comicy and readable like Tintin, so if I go too realistic it would break the style. I never made a rain pixelation so it is a puzzle still. Haha, those monks aren't that smart, it is all about the journey after all (except when it rains.. ) 

I saw what eishiya was saying, but wondered if there wasn't a simpler fix.  And one that might be more in keeping with your style and theme of the comic.  Basically it's what I would've done and maybe what the monks would've done... A SHORTCUT!   (...thank God. )

I will make it great again in the final comic version. Thanks for the help DexRunner!  

It might be easier to take the black outline off the rocks toward the back. Like the top picture fades the further away you get.  Just that one little adjustment could save a big rework under those thunder clouds. 

I would try it! Thanks for the test and feedback, much appreciated! You can see the final result in the upcoming comic: The Homecoming Monks.  

I am not usually a fan of heavy dithering so from the thumbnail, I didn't expect to like this, but I was pleasantly surprised :D

The rain feels a bit flat, there's no sense that there are more raindrops the further you go. Obviously you can't draw them all, but perhaps you could make the distant parts that are getting rained on bluer? I tried to make an edit using your existing colours that does this, but you could probably do better it with some extra colours.