Parallax Background - Plains - Pixel Art

I see, definitely! Honestly, I'm still learning how to draw backgrounds/landscapes.  It's a long term journey, probably without end! I use the Youtube school. So, here are my recommendations (they are not related to pixel art, however, they greatly helped me to improve):

• Jordan Grimmer's Channel: https://www.youtube.com/@JordanGrimmer/videos
• Philip Sue Art's Channel: https://www.youtube.com/@philipsue_art/videos
• The Creative Space's Channel: https://www.youtube.com/@davidjosephcreativespace/videos
  

Outside of that, I watched tons of Bob Ross videos and many nature related documentaries! Developing love for nature also helps, because that will fill you with enthusiasm to learn and be inspired to make better art. Turning everything into pixels is the easiest part, because it will feel like painting. It takes time, so be patient.

But if you need something REALLY fast, briefly I can say: 

• Do some concepts and composition sketches (without worrying about colors and details)
• Try to go with greyscale alone (working only with values, lights and shadows)

When you're satisfied with the results...

• Make strong use of layers, and start working from background layers towards foreground
• Do thumbnails (in really small resolutions), until you're satisfied. If the landscape doesn't work well in thumbnail format, the chances are that it won't look good in bigger resolutions. But don't be discouraged if that happens. It's very easy to correct digital art!
• Increase the resolution and start adding small details and character
• Add color! Try experimenting with saturation, light and blend modes

Pixel Art. All the above can be called a pre-work to making a pixel version of the landscape. It will save you tons of time, because you will be able to envision the whole piece and still have many problems that could arise in the process already solved.

Most importantly... have FUN! Don't turn it into a chore. Also, let go perfeccionism. Just be happy with what you can accomplish, and gradually keep improving, step by step.

That's it!