I was thinking, that next to pencil doodling, pixel art is one of the fastest mediums in which you can go from initial concept to finalized image (around ~1 hour up to 3 for such pieces? Imagine doing oils or acrylics). If you find yourself not finishing small pixel art pieces like these consistently, I'm afraid you're going to have a problem with almost all other types of art. I'm not King Finisher either, but for what it's worth, I urge you to press yourself to finish these and cyclo.
I gotta fully agree with Helm here. Coming from experience, the average time I have taken on an acrylic painting or larger sized natural medium project, is probably upwards of 8-10 hours, depending on medium and technique, as well as subject matter. Pixel art is fairly fast in comparison, but comparing digital medium to natural medium gets a little tougher, especially considering the huge discrepency in technique (closest comparison would be pointilism, but even then... yeah)
As for the sprites themselves: I must say, those colour choices are insane, and yet they work SOOOO nicely. One thing I learned from working with natural mediums, which you never really get as much with pixels, is the subtle arrangement of seemingly nonsensical colours to make an amazingly natural looking piece. You've pulled this off superbly, it really kinda gives all of these a natural look, something I applaud you for intensely. I can't wait to see more crazy palettes from you.
Awesome job, lots of love.