haha, I know this one. Nice to see you kept on doing pixel art.
I like the amount of detail you put into this.
I however think that it's a bit overdihtered, especially the sky.
I haven't actually done any 3-color pieces like, ever, so I might be wrong, but I think you can get creative with uneven dihtering, some random spots and some larger same-color clusters :)
I'm telling ya this because that is what I myself had been told a LOT, a while back :D
Gratz on your first original pixelart! :)
Nice scene. If you create another piece like this, it would be good to investigate different dither patterns to give more variety and dimension to a low colour count pictures.