Thanks for the feedback @JerareYoshi.
Based on it, I sought the solution to the problem that arose when I produced the first two wallpapers. As a result of this intense search and after several attempts, here I present:
Ubuntu Unity Remix 20.04 Focal Fossa wallpaper:
Black background version:
Gradient version:
Ubuntu Unity Remix 20.x Series Wallpaper:
Any errors you find, just let me know here that I will be correcting. 