Yeah, I get that - it took several months for me to even make works like this, haha. The main reason was because of how difficult it was, and they just added a new tool to Pixilart as well, which is the Spray Paint Tool. Overall, there's a lot of things you can use, have to get used to, and learn how to use and find what works best for what. For example, I *highly* recommend using the spray paint tool when making night skies, as that's always what I use when making my own night skies, and they turn out like the ones shown (they still take a *lot* of time to make though, as I use several layers *just* to make *one* night sky, as I use different opacities to have different colors without making them too obnoxious compared to others (For example: The purples of the night sky in the art we're commenting on was put on a layer separate from the rest of the sky, which was so that I could lower to opacity and have the purple blend with the blues nicer, as I didn't want it standing out and looking off compared to the blues. The clouds, stars, and moonlight are also their own individual layers, along with the foreground (tree, waterfall, wolf, grass, etc. (the waterfall consists of two separate layers, though)). For clouds, more specifically clouds like the ones I made, I recommend using the paint brush. Yet, this requires a *lot* of practice, as it takes a lot of patience and skill to properly blend things, give them that proper cloud texture, and so on and so forth (I actually had to remake the clouds, like... three times, haha). To get the grass like I did, I used the pain brush for that as well, though I have a touch-screen computer, which made it a lot easier than using a mouse/touchpad (with a touch screen, I could lightly flick my finger up to make the grass look spiky and more realistic). The leafy part of the tree was also made with the paint brush, so, overall, I suggest the paint brush tool for *anything* that is either:
-Wispy/Puffy (like clouds)
-Bushy (tree leaves and/or bushes)
-Grass-like
As for drawing things, like the wolf, that more-so relies on yourself and your ability to draw, as I drew it completely free-hand with the pencil tool, just had to make some minor adjustments to it throughout, then add shading and yada yada yada. Speaking of shading, always keep an eye on where your light source is to get the shading just right (I didn't have to focus on that too much since I wanted the foreground to basically be one big silhouette, though there is